138981395 has 24 divisors (see below), whose sum is σ = 194677344. Its totient is φ = 94972416.

The previous prime is 138981391. The next prime is 138981407. The reversal of 138981395 is 593189831.

It is not a de Polignac number, because 138981395 - 2² = 138981391 is a prime.

It is a super-2 number, since 2×138981395² = 38631656312292050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138981391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85682 + ... + 87288.

It is an arithmetic number, because the mean of its divisors is an integer number (8111556).

Almost surely, 2^138981395 is an apocalyptic number.

138981395 is a deficient number, since it is larger than the sum of its proper divisors (55695949).

138981395 is a wasteful number, since it uses less digits than its factorization.

138981395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979 (or 1972 counting only the distinct ones).

The product of its digits is 233280, while the sum is 47.

The square root of 138981395 is about 11789.0370683954. The cubic root of 138981395 is about 517.9870340071.

The spelling of 138981395 in words is "one hundred thirty-eight million, nine hundred eighty-one thousand, three hundred ninety-five".