1938684931 has 4 divisors (see below), whose sum is σ = 2040721000. Its totient is φ = 1836648864.

The previous prime is 1938684929. The next prime is 1938684941. The reversal of 1938684931 is 1394868391.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1938684931 - 2¹ = 1938684929 is a prime.

It is a super-2 number, since 2×1938684931² = 7516998523372949522, which contains 22 as substring.

It is the 44031-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938684911) by changing a digit.

It is a nontrivial repunit in base 44030.

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 3 ways as a sum of consecutive naturals, for example, 51018006 + ... + 51018043.

It is an arithmetic number, because the mean of its divisors is an integer number (510180250).

Almost surely, 2^1938684931 is an apocalyptic number.

1938684931 is a deficient number, since it is larger than the sum of its proper divisors (102036069).

1938684931 is a wasteful number, since it uses less digits than its factorization.

1938684931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102036068.

The product of its digits is 1119744, while the sum is 52.

The square root of 1938684931 is about 44030.5000085168. The cubic root of 1938684931 is about 1246.9118287885.

The spelling of 1938684931 in words is "one billion, nine hundred thirty-eight million, six hundred eighty-four thousand, nine hundred thirty-one".