139689839 has 8 divisors (see below), whose sum is σ = 144701760. Its totient is φ = 134690976.

The previous prime is 139689793. The next prime is 139689853. The reversal of 139689839 is 938986931.

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 139689839 - 2¹² = 139685743 is a prime.

It is a super-2 number, since 2×139689839² = 39026502239691842, 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 (139689889) 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, 21914 + ... + 27560.

It is an arithmetic number, because the mean of its divisors is an integer number (18087720).

Almost surely, 2^139689839 is an apocalyptic number.

139689839 is a deficient number, since it is larger than the sum of its proper divisors (5011921).

139689839 is an equidigital number, since it uses as much as digits as its factorization.

139689839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6529.

The product of its digits is 2519424, while the sum is 56.

The square root of 139689839 is about 11819.0456044471. The cubic root of 139689839 is about 518.8656721004.

The spelling of 139689839 in words is "one hundred thirty-nine million, six hundred eighty-nine thousand, eight hundred thirty-nine".