3981357 has 12 divisors (see below), whose sum is σ = 5794620. Its totient is φ = 2634048.

The previous prime is 3981343. The next prime is 3981389. The reversal of 3981357 is 7531893.

It can be written as a sum of positive squares in 2 ways, for example, as 1758276 + 2223081 = 1326^2 + 1491^2 .

It is not a de Polignac number, because 3981357 - 2⁸ = 3981101 is a prime.

It is a super-2 number, since 2×3981357² = 31702407122898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 382 + ... + 2847.

It is an arithmetic number, because the mean of its divisors is an integer number (482885).

Almost surely, 2^3981357 is an apocalyptic number.

It is an amenable number.

3981357 is a deficient number, since it is larger than the sum of its proper divisors (1813263).

3981357 is a wasteful number, since it uses less digits than its factorization.

3981357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372 (or 3369 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 3981357 is about 1995.3338066599. Note that the first 3 decimals coincide. The cubic root of 3981357 is about 158.4931050814.

The spelling of 3981357 in words is "three million, nine hundred eighty-one thousand, three hundred fifty-seven".