138598742 has 8 divisors (see below), whose sum is σ = 208031232. Its totient is φ = 69255000.

The previous prime is 138598703. The next prime is 138598751. The reversal of 138598742 is 247895831.

It is a happy number.

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

It is a super-2 number, since 2×138598742² = 38419222567965128, 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 3 ways as a sum of consecutive naturals, for example, 18134 + ... + 24617.

It is an arithmetic number, because the mean of its divisors is an integer number (26003904).

Almost surely, 2^138598742 is an apocalyptic number.

138598742 is a deficient number, since it is larger than the sum of its proper divisors (69432490).

138598742 is a wasteful number, since it uses less digits than its factorization.

138598742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44374.

The product of its digits is 483840, while the sum is 47.

The square root of 138598742 is about 11772.7966940740. The cubic root of 138598742 is about 517.5112113762.

The spelling of 138598742 in words is "one hundred thirty-eight million, five hundred ninety-eight thousand, seven hundred forty-two".