3981557 has 4 divisors (see below), whose sum is σ = 3996960. Its totient is φ = 3966156.

The previous prime is 3981541. The next prime is 3981563. The reversal of 3981557 is 7551893.

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 not a de Polignac number, because 3981557 - 2⁴ = 3981541 is a prime.

It is a super-2 number, since 2×3981557² = 31705592288498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3981557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7307 + ... + 7832.

It is an arithmetic number, because the mean of its divisors is an integer number (999240).

Almost surely, 2^3981557 is an apocalyptic number.

It is an amenable number.

3981557 is a deficient number, since it is larger than the sum of its proper divisors (15403).

3981557 is a wasteful number, since it uses less digits than its factorization.

3981557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15402.

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

The square root of 3981557 is about 1995.3839229582. The cubic root of 3981557 is about 158.4957589580.

The spelling of 3981557 in words is "three million, nine hundred eighty-one thousand, five hundred fifty-seven".