3685621 has 4 divisors (see below), whose sum is σ = 3804544. Its totient is φ = 3566700.

The previous prime is 3685597. The next prime is 3685631. The reversal of 3685621 is 1265863.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3685621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 118891 = 3685621 / (3 + 6 + 8 + 5 + 6 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3685631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59415 + ... + 59476.

It is an arithmetic number, because the mean of its divisors is an integer number (951136).

Almost surely, 2^3685621 is an apocalyptic number.

3685621 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3685621 is a deficient number, since it is larger than the sum of its proper divisors (118923).

3685621 is a wasteful number, since it uses less digits than its factorization.

3685621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118922.

The product of its digits is 8640, while the sum is 31.

The square root of 3685621 is about 1919.7971246983. The cubic root of 3685621 is about 154.4674194591.

The spelling of 3685621 in words is "three million, six hundred eighty-five thousand, six hundred twenty-one".