139242500 has 30 divisors (see below), whose sum is σ = 304500966. Its totient is φ = 55696000.

The previous prime is 139242497. The next prime is 139242503. The reversal of 139242500 is 5242931.

It is an interprime number because it is at equal distance from previous prime (139242497) and next prime (139242503).

It can be written as a sum of positive squares in 5 ways, for example, as 11235904 + 128006596 = 3352^2 + 11314^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139242500.

It is not an unprimeable number, because it can be changed into a prime (139242503) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 25349 + ... + 30348.

Almost surely, 2^139242500 is an apocalyptic number.

139242500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139242500 is an abundant number, since it is smaller than the sum of its proper divisors (165258466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139242500 is an equidigital number, since it uses as much as digits as its factorization.

139242500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55721 (or 55704 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 139242500 is about 11800.1059317279. The cubic root of 139242500 is about 518.3112126382.

It can be divided in two parts, 13924 and 2500, that multiplied together give a square (34810000 = 5900²).

The spelling of 139242500 in words is "one hundred thirty-nine million, two hundred forty-two thousand, five hundred".