139550639 has 8 divisors (see below), whose sum is σ = 146104560. Its totient is φ = 133112896.

The previous prime is 139550633. The next prime is 139550641. The reversal of 139550639 is 936055931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139550639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139550596 and 139550605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139550633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26582 + ... + 31395.

It is an arithmetic number, because the mean of its divisors is an integer number (18263070).

Almost surely, 2^139550639 is an apocalyptic number.

139550639 is a deficient number, since it is larger than the sum of its proper divisors (6553921).

139550639 is an equidigital number, since it uses as much as digits as its factorization.

139550639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58089.

The product of its (nonzero) digits is 109350, while the sum is 41.

The square root of 139550639 is about 11813.1553363189. The cubic root of 139550639 is about 518.6932660846.

The spelling of 139550639 in words is "one hundred thirty-nine million, five hundred fifty thousand, six hundred thirty-nine".