139678623 has 18 divisors (see below), whose sum is σ = 230735544. Its totient is φ = 79762752.

The previous prime is 139678621. The next prime is 139678639. The reversal of 139678623 is 326876931.

139678623 is a `hidden beast` number, since 13 + 9 + 6 + 7 + 8 + 623 = 666.

It is not a de Polignac number, because 139678623 - 2¹ = 139678621 is a prime.

It is a super-2 number, since 2×139678623² = 39020235446352258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139678621) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 93063 + ... + 94551.

Almost surely, 2^139678623 is an apocalyptic number.

139678623 is a deficient number, since it is larger than the sum of its proper divisors (91056921).

139678623 is an frugal number, since it uses more digits than its factorization.

139678623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2991 (or 1499 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 139678623 is about 11818.5711065255. The cubic root of 139678623 is about 518.8517847789.

Multiplying 139678623 by its product of digits (326592), we get a square (45617920842816 = 6754104²).

The spelling of 139678623 in words is "one hundred thirty-nine million, six hundred seventy-eight thousand, six hundred twenty-three".