1939989381 has 16 divisors (see below), whose sum is σ = 2860461120. Its totient is φ = 1159643520.

The previous prime is 1939989379. The next prime is 1939989397. The reversal of 1939989381 is 1839899391.

1939989381 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1939989381 - 2¹ = 1939989379 is a prime.

It is a super-2 number, since 2×1939989381² = 7527117596785526322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1939989371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400246 + ... + 405063.

It is an arithmetic number, because the mean of its divisors is an integer number (178778820).

Almost surely, 2^1939989381 is an apocalyptic number.

1939989381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1939989381 is a deficient number, since it is larger than the sum of its proper divisors (920471739).

1939989381 is a wasteful number, since it uses less digits than its factorization.

1939989381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805396.

The product of its digits is 3779136, while the sum is 60.

The square root of 1939989381 is about 44045.3105449377. The cubic root of 1939989381 is about 1247.1914288822.

The spelling of 1939989381 in words is "one billion, nine hundred thirty-nine million, nine hundred eighty-nine thousand, three hundred eighty-one".