3891438402 has 16 divisors (see below), whose sum is σ = 8121263040. Its totient is φ = 1240748432.

The previous prime is 3891438389. The next prime is 3891438437. The reversal of 3891438402 is 2048341983.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14099277 + ... + 14099552.

It is an arithmetic number, because the mean of its divisors is an integer number (507578940).

Almost surely, 2^3891438402 is an apocalyptic number.

3891438402 is an abundant number, since it is smaller than the sum of its proper divisors (4229824638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3891438402 is a wasteful number, since it uses less digits than its factorization.

3891438402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28198857.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 3891438402 is about 62381.3946782212. The cubic root of 3891438402 is about 1572.9082371106.

The spelling of 3891438402 in words is "three billion, eight hundred ninety-one million, four hundred thirty-eight thousand, four hundred two".