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3975691 = 9374243
BaseRepresentation
bin1111001010101000001011
321110222121211
433022220023
52004210231
6221113551
745535636
oct17125013
97428554
103975691
112275aa5
1213b88b7
13a927a5
14756c1d
15537eb1
hex3caa0b

3975691 has 4 divisors (see below), whose sum is σ = 3980872. Its totient is φ = 3970512.

The previous prime is 3975677. The next prime is 3975701. The reversal of 3975691 is 1965793.

3975691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1965793 = 2577649.

It is a cyclic number.

It is not a de Polignac number, because 3975691 - 25 = 3975659 is a prime.

It is a super-2 number, since 2×39756912 = 31612237854962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3975661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185 + ... + 3058.

It is an arithmetic number, because the mean of its divisors is an integer number (995218).

Almost surely, 23975691 is an apocalyptic number.

3975691 is a deficient number, since it is larger than the sum of its proper divisors (5181).

3975691 is an equidigital number, since it uses as much as digits as its factorization.

3975691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180.

The product of its digits is 51030, while the sum is 40.

The square root of 3975691 is about 1993.9134885947. The cubic root of 3975691 is about 158.4178838045.

The spelling of 3975691 in words is "three million, nine hundred seventy-five thousand, six hundred ninety-one".

Divisors: 1 937 4243 3975691