139900052 has 6 divisors (see below), whose sum is σ = 244825098. Its totient is φ = 69950024.

The previous prime is 139900043. The next prime is 139900091. The reversal of 139900052 is 250009931.

It can be written as a sum of positive squares in only one way, i.e., 106213636 + 33686416 = 10306^2 + 5804^2 .

It is a junction number, because it is equal to n+sod(n) for n = 139899988 and 139900024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17487503 + ... + 17487510.

It is an arithmetic number, because the mean of its divisors is an integer number (40804183).

Almost surely, 2^139900052 is an apocalyptic number.

It is an amenable number.

139900052 is a deficient number, since it is larger than the sum of its proper divisors (104925046).

139900052 is a wasteful number, since it uses less digits than its factorization.

139900052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34975017 (or 34975015 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 139900052 is about 11827.9352382400. The cubic root of 139900052 is about 519.1258142442.

Adding to 139900052 its reverse (250009931), we get a palindrome (389909983).

The spelling of 139900052 in words is "one hundred thirty-nine million, nine hundred thousand, fifty-two".