139240881 has 24 divisors (see below), whose sum is σ = 218847720. Its totient is φ = 84796416.

The previous prime is 139240847. The next prime is 139240889. The reversal of 139240881 is 188042931.

It can be written as a sum of positive squares in 4 ways, for example, as 26010000 + 113230881 = 5100^2 + 10641^2 .

It is not a de Polignac number, because 139240881 - 2⁷ = 139240753 is a prime.

It is a super-2 number, since 2×139240881² = 38776045883312322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139240889) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5215 + ... + 17483.

It is an arithmetic number, because the mean of its divisors is an integer number (9118655).

Almost surely, 2^139240881 is an apocalyptic number.

It is an amenable number.

139240881 is a deficient number, since it is larger than the sum of its proper divisors (79606839).

139240881 is a wasteful number, since it uses less digits than its factorization.

139240881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12385 (or 12382 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 139240881 is about 11800.0373304494. The cubic root of 139240881 is about 518.3092037949.

The spelling of 139240881 in words is "one hundred thirty-nine million, two hundred forty thousand, eight hundred eighty-one".