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3900721 = 111013511
BaseRepresentation
bin1110111000010100110001
321100011210011
432320110301
51444310341
6215334521
745104236
oct16702461
97304704
103900721
112224740
121381441
13a67626
1473778d
15520b81
hex3b8531

3900721 has 8 divisors (see below), whose sum is σ = 4298688. Its totient is φ = 3510000.

The previous prime is 3900707. The next prime is 3900733. The reversal of 3900721 is 1270093.

3900721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3900721 - 221 = 1803569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3900692 and 3900701.

It is not an unprimeable number, because it can be changed into a prime (3900121) 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 7 ways as a sum of consecutive naturals, for example, 645 + ... + 2866.

It is an arithmetic number, because the mean of its divisors is an integer number (537336).

Almost surely, 23900721 is an apocalyptic number.

It is an amenable number.

3900721 is a deficient number, since it is larger than the sum of its proper divisors (397967).

3900721 is a wasteful number, since it uses less digits than its factorization.

3900721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 3900721 is about 1975.0243036479. The cubic root of 3900721 is about 157.4157910477.

The spelling of 3900721 in words is "three million, nine hundred thousand, seven hundred twenty-one".

Divisors: 1 11 101 1111 3511 38621 354611 3900721