139473631 has 8 divisors (see below), whose sum is σ = 154080000. Its totient is φ = 125188440.

The previous prime is 139473629. The next prime is 139473637. The reversal of 139473631 is 136374931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139473631 - 2¹ = 139473629 is a prime.

It is a super-2 number, since 2×139473631² = 38905787488648322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139473637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79381 + ... + 81118.

It is an arithmetic number, because the mean of its divisors is an integer number (19260000).

Almost surely, 2^139473631 is an apocalyptic number.

139473631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139473631 is a deficient number, since it is larger than the sum of its proper divisors (14606369).

139473631 is a wasteful number, since it uses less digits than its factorization.

139473631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160589.

The product of its digits is 40824, while the sum is 37.

The square root of 139473631 is about 11809.8954694781. The cubic root of 139473631 is about 518.5978386448.

It can be divided in two parts, 13947 and 3631, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 139473631 in words is "one hundred thirty-nine million, four hundred seventy-three thousand, six hundred thirty-one".