1916139381 has 32 divisors (see below), whose sum is σ = 2856150528. Its totient is φ = 1135088640.

The previous prime is 1916139371. The next prime is 1916139413. The reversal of 1916139381 is 1839316191.

It is not a de Polignac number, because 1916139381 - 2⁵ = 1916139349 is a prime.

It is a super-2 number, since 2×1916139381² = 7343180254838126322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916139311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103245 + ... + 120381.

It is an arithmetic number, because the mean of its divisors is an integer number (89254704).

Almost surely, 2^1916139381 is an apocalyptic number.

It is an amenable number.

1916139381 is a deficient number, since it is larger than the sum of its proper divisors (940011147).

1916139381 is a wasteful number, since it uses less digits than its factorization.

1916139381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17261.

The product of its digits is 34992, while the sum is 42.

The square root of 1916139381 is about 43773.7293476350. The cubic root of 1916139381 is about 1242.0593989085.

The spelling of 1916139381 in words is "one billion, nine hundred sixteen million, one hundred thirty-nine thousand, three hundred eighty-one".