139915918 has 8 divisors (see below), whose sum is σ = 209951280. Its totient is φ = 69932160.

The previous prime is 139915913. The next prime is 139915931. The reversal of 139915918 is 819519931.

139915918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-4 number, since 4×139915918⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139915913) 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, 5203 + ... + 17518.

It is an arithmetic number, because the mean of its divisors is an integer number (26243910).

Almost surely, 2^139915918 is an apocalyptic number.

139915918 is a deficient number, since it is larger than the sum of its proper divisors (70035362).

139915918 is a wasteful number, since it uses less digits than its factorization.

139915918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25802.

The product of its digits is 87480, while the sum is 46.

The square root of 139915918 is about 11828.6059195494. The cubic root of 139915918 is about 519.1454381083.

The spelling of 139915918 in words is "one hundred thirty-nine million, nine hundred fifteen thousand, nine hundred eighteen".