3975731 has 4 divisors (see below), whose sum is σ = 4185000. Its totient is φ = 3766464.

The previous prime is 3975721. The next prime is 3975749. The reversal of 3975731 is 1375793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1375793 = 17 ⋅80929.

It is a cyclic number.

It is not a de Polignac number, because 3975731 - 2⁶ = 3975667 is a prime.

It is a super-2 number, since 2×3975731² = 31612873968722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3975691 and 3975700.

It is not an unprimeable number, because it can be changed into a prime (3975701) 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, 104606 + ... + 104643.

It is an arithmetic number, because the mean of its divisors is an integer number (1046250).

Almost surely, 2^3975731 is an apocalyptic number.

3975731 is a deficient number, since it is larger than the sum of its proper divisors (209269).

3975731 is a wasteful number, since it uses less digits than its factorization.

3975731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209268.

The product of its digits is 19845, while the sum is 35.

The square root of 3975731 is about 1993.9235190950. The cubic root of 3975731 is about 158.4184150911.

The spelling of 3975731 in words is "three million, nine hundred seventy-five thousand, seven hundred thirty-one".