139961379 has 4 divisors (see below), whose sum is σ = 186615176. Its totient is φ = 93307584.

The previous prime is 139961333. The next prime is 139961383. The reversal of 139961379 is 973169931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 139961379 - 2⁷ = 139961251 is a prime.

It is a super-2 number, since 2×139961379² = 39178375223163282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139961309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23326894 + ... + 23326899.

It is an arithmetic number, because the mean of its divisors is an integer number (46653794).

Almost surely, 2^139961379 is an apocalyptic number.

139961379 is a deficient number, since it is larger than the sum of its proper divisors (46653797).

139961379 is an equidigital number, since it uses as much as digits as its factorization.

139961379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46653796.

The product of its digits is 275562, while the sum is 48.

The square root of 139961379 is about 11830.5274185051. The cubic root of 139961379 is about 519.2016583379.

The spelling of 139961379 in words is "one hundred thirty-nine million, nine hundred sixty-one thousand, three hundred seventy-nine".