139212730 has 16 divisors (see below), whose sum is σ = 250857000. Its totient is φ = 55624192.

The previous prime is 139212659. The next prime is 139212757. The reversal of 139212730 is 37212931.

139212730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 138368169 + 844561 = 11763^2 + 919^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2646 + ... + 16894.

Almost surely, 2^139212730 is an apocalyptic number.

139212730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139212730 is a deficient number, since it is larger than the sum of its proper divisors (111644270).

139212730 is a wasteful number, since it uses less digits than its factorization.

139212730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15233.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 139212730 is about 11798.8444349436. The cubic root of 139212730 is about 518.2742717507.

The spelling of 139212730 in words is "one hundred thirty-nine million, two hundred twelve thousand, seven hundred thirty".