3557981 has 16 divisors (see below), whose sum is σ = 4458240. Its totient is φ = 2768640.

The previous prime is 3557977. The next prime is 3557987. The reversal of 3557981 is 1897553.

It is not a de Polignac number, because 3557981 - 2² = 3557977 is a prime.

It is a super-2 number, since 2×3557981² = 25318457592722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3557987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2936 + ... + 3966.

It is an arithmetic number, because the mean of its divisors is an integer number (278640).

Almost surely, 2^3557981 is an apocalyptic number.

It is an amenable number.

3557981 is a deficient number, since it is larger than the sum of its proper divisors (900259).

3557981 is a wasteful number, since it uses less digits than its factorization.

3557981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084.

The product of its digits is 37800, while the sum is 38.

The square root of 3557981 is about 1886.2611166008. The cubic root of 3557981 is about 152.6632632952.

The spelling of 3557981 in words is "three million, five hundred fifty-seven thousand, nine hundred eighty-one".