139998507 has 32 divisors (see below), whose sum is σ = 209018880. Its totient is φ = 82636320.

The previous prime is 139998503. The next prime is 139998541. The reversal of 139998507 is 705899931.

It is a happy number.

It is not a de Polignac number, because 139998507 - 2² = 139998503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139998507.

It is not an unprimeable number, because it can be changed into a prime (139998503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216058 + ... + 216704.

It is an arithmetic number, because the mean of its divisors is an integer number (6531840).

Almost surely, 2^139998507 is an apocalyptic number.

139998507 is a deficient number, since it is larger than the sum of its proper divisors (69020373).

139998507 is a wasteful number, since it uses less digits than its factorization.

139998507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 139998507 is about 11832.0964752659. The cubic root of 139998507 is about 519.2475643705.

The spelling of 139998507 in words is "one hundred thirty-nine million, nine hundred ninety-eight thousand, five hundred seven".