3954920639 has 12 divisors (see below), whose sum is σ = 4163360712. Its totient is φ = 3754117440.

The previous prime is 3954920603. The next prime is 3954920653. The reversal of 3954920639 is 9360294593.

It is a de Polignac number, because none of the positive numbers 2^k-3954920639 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 (3954920659) 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, 30404 + ... + 93990.

It is an arithmetic number, because the mean of its divisors is an integer number (346946726).

Almost surely, 2^3954920639 is an apocalyptic number.

3954920639 is a deficient number, since it is larger than the sum of its proper divisors (208440073).

3954920639 is an equidigital number, since it uses as much as digits as its factorization.

3954920639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63706 (or 63665 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 50.

The square root of 3954920639 is about 62888.1597679563. The cubic root of 3954920639 is about 1581.4152569262.

The spelling of 3954920639 in words is "three billion, nine hundred fifty-four million, nine hundred twenty thousand, six hundred thirty-nine".