138251895 has 8 divisors (see below), whose sum is σ = 221203056. Its totient is φ = 73734336.

The previous prime is 138251879. The next prime is 138251917. The reversal of 138251895 is 598152831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138251895 - 2⁴ = 138251879 is a prime.

It is a super-2 number, since 2×138251895² = 38227172942182050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4608382 + ... + 4608411.

It is an arithmetic number, because the mean of its divisors is an integer number (27650382).

Almost surely, 2^138251895 is an apocalyptic number.

138251895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138251895 is a deficient number, since it is larger than the sum of its proper divisors (82951161).

138251895 is an equidigital number, since it uses as much as digits as its factorization.

138251895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9216801.

The product of its digits is 86400, while the sum is 42.

The square root of 138251895 is about 11758.0565996256. The cubic root of 138251895 is about 517.0791556225.

The spelling of 138251895 in words is "one hundred thirty-eight million, two hundred fifty-one thousand, eight hundred ninety-five".