3908140397 has 4 divisors (see below), whose sum is σ = 4466446176. Its totient is φ = 3349834620.

The previous prime is 3908140373. The next prime is 3908140487. The reversal of 3908140397 is 7930418093.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7930418093 = 13 ⋅610032161.

It is a cyclic number.

It is not a de Polignac number, because 3908140397 - 2⁸ = 3908140141 is a prime.

It is a super-2 number, since 2×3908140397² = 30547122725326635218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3908140367) 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, 279152879 + ... + 279152892.

It is an arithmetic number, because the mean of its divisors is an integer number (1116611544).

Almost surely, 2^3908140397 is an apocalyptic number.

It is an amenable number.

3908140397 is a deficient number, since it is larger than the sum of its proper divisors (558305779).

3908140397 is an equidigital number, since it uses as much as digits as its factorization.

3908140397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558305778.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 3908140397 is about 62515.1213467590. The cubic root of 3908140397 is about 1575.1553248344.

The spelling of 3908140397 in words is "three billion, nine hundred eight million, one hundred forty thousand, three hundred ninety-seven".