139189815 has 24 divisors (see below), whose sum is σ = 241729488. Its totient is φ = 74090880.

The previous prime is 139189811. The next prime is 139189823. The reversal of 139189815 is 518981931.

It is not a de Polignac number, because 139189815 - 2² = 139189811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139189811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22987 + ... + 28403.

It is an arithmetic number, because the mean of its divisors is an integer number (10072062).

Almost surely, 2^139189815 is an apocalyptic number.

139189815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139189815 is a deficient number, since it is larger than the sum of its proper divisors (102539673).

139189815 is a wasteful number, since it uses less digits than its factorization.

139189815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5999 (or 5996 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The square root of 139189815 is about 11797.8733253074. The cubic root of 139189815 is about 518.2458334831.

The spelling of 139189815 in words is "one hundred thirty-nine million, one hundred eighty-nine thousand, eight hundred fifteen".