139370881 has 4 divisors (see below), whose sum is σ = 150091732. Its totient is φ = 128650032.

The previous prime is 139370851. The next prime is 139370887. The reversal of 139370881 is 188073931.

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

It can be written as a sum of positive squares in 2 ways, for example, as 79834225 + 59536656 = 8935^2 + 7716^2 .

It is a cyclic number.

It is not a de Polignac number, because 139370881 - 2⁷ = 139370753 is a prime.

It is a super-2 number, since 2×139370881² = 38848484941432322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139370887) 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, 5360406 + ... + 5360431.

It is an arithmetic number, because the mean of its divisors is an integer number (37522933).

Almost surely, 2^139370881 is an apocalyptic number.

It is an amenable number.

139370881 is a deficient number, since it is larger than the sum of its proper divisors (10720851).

139370881 is a wasteful number, since it uses less digits than its factorization.

139370881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10720850.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 139370881 is about 11805.5445024785. The cubic root of 139370881 is about 518.4704572941.

The spelling of 139370881 in words is "one hundred thirty-nine million, three hundred seventy thousand, eight hundred eighty-one".