138252394 has 8 divisors (see below), whose sum is σ = 237004128. Its totient is φ = 59251020.

The previous prime is 138252391. The next prime is 138252397. The reversal of 138252394 is 493252831.

138252394 is digitally balanced in base 3, 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 (138252391) and next prime (138252397).

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

It is a super-2 number, since 2×138252394² = 38227448893462472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138252391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4937572 + ... + 4937599.

It is an arithmetic number, because the mean of its divisors is an integer number (29625516).

Almost surely, 2^138252394 is an apocalyptic number.

138252394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138252394 is a deficient number, since it is larger than the sum of its proper divisors (98751734).

138252394 is an equidigital number, since it uses as much as digits as its factorization.

138252394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9875180.

The product of its digits is 51840, while the sum is 37.

The square root of 138252394 is about 11758.0778190995. The cubic root of 138252394 is about 517.0797777289.

The spelling of 138252394 in words is "one hundred thirty-eight million, two hundred fifty-two thousand, three hundred ninety-four".