3920139397 has 4 divisors (see below), whose sum is σ = 3920769216. Its totient is φ = 3919509580.

The previous prime is 3920139383. The next prime is 3920139469. The reversal of 3920139397 is 7939310293.

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: 7939310293 = 211 ⋅37627063.

It is a cyclic number.

It is not a de Polignac number, because 3920139397 - 2⁷ = 3920139269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3920139367) 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, 305479 + ... + 318052.

It is an arithmetic number, because the mean of its divisors is an integer number (980192304).

Almost surely, 2^3920139397 is an apocalyptic number.

It is an amenable number.

3920139397 is a deficient number, since it is larger than the sum of its proper divisors (629819).

3920139397 is an equidigital number, since it uses as much as digits as its factorization.

3920139397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629818.

The product of its (nonzero) digits is 275562, while the sum is 46.

The square root of 3920139397 is about 62611.0165785543. The cubic root of 3920139397 is about 1576.7657223490.

The spelling of 3920139397 in words is "three billion, nine hundred twenty million, one hundred thirty-nine thousand, three hundred ninety-seven".