138562431 has 8 divisors (see below), whose sum is σ = 211142784. Its totient is φ = 79178520.

The previous prime is 138562429. The next prime is 138562433. The reversal of 138562431 is 134265831.

138562431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138562429) and next prime (138562433).

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

It is not a de Polignac number, because 138562431 - 2¹ = 138562429 is a prime.

It is a super-2 number, since 2×138562431² = 38399094569259522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138562392 and 138562401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138562433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3299085 + ... + 3299126.

It is an arithmetic number, because the mean of its divisors is an integer number (26392848).

Almost surely, 2^138562431 is an apocalyptic number.

138562431 is a deficient number, since it is larger than the sum of its proper divisors (72580353).

138562431 is an equidigital number, since it uses as much as digits as its factorization.

138562431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6598221.

The product of its digits is 17280, while the sum is 33.

The square root of 138562431 is about 11771.2544361253. The cubic root of 138562431 is about 517.4660137778.

The spelling of 138562431 in words is "one hundred thirty-eight million, five hundred sixty-two thousand, four hundred thirty-one".