138253438 has 8 divisors (see below), whose sum is σ = 207695880. Its totient is φ = 69021480.

The previous prime is 138253429. The next prime is 138253457. The reversal of 138253438 is 834352831.

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

It is a super-2 number, since 2×138253438² = 38228026237639688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138253397 and 138253406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50968 + ... + 53611.

It is an arithmetic number, because the mean of its divisors is an integer number (25961985).

Almost surely, 2^138253438 is an apocalyptic number.

138253438 is a deficient number, since it is larger than the sum of its proper divisors (69442442).

138253438 is a wasteful number, since it uses less digits than its factorization.

138253438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105242.

The product of its digits is 69120, while the sum is 37.

The square root of 138253438 is about 11758.1222140272. The cubic root of 138253438 is about 517.0810792855.

The spelling of 138253438 in words is "one hundred thirty-eight million, two hundred fifty-three thousand, four hundred thirty-eight".