139290881 has 8 divisors (see below), whose sum is σ = 146731200. Its totient is φ = 131861520.

The previous prime is 139290869. The next prime is 139290887. The reversal of 139290881 is 188092931.

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

It is a de Polignac number, because none of the positive numbers 2^k-139290881 is a prime.

It is a super-2 number, since 2×139290881² = 38803899059512322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139290887) 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, 43700 + ... + 46778.

It is an arithmetic number, because the mean of its divisors is an integer number (18341400).

Almost surely, 2^139290881 is an apocalyptic number.

It is an amenable number.

139290881 is a deficient number, since it is larger than the sum of its proper divisors (7440319).

139290881 is a wasteful number, since it uses less digits than its factorization.

139290881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5479.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 139290881 is about 11802.1557776535. The cubic root of 139290881 is about 518.3712362445.

The spelling of 139290881 in words is "one hundred thirty-nine million, two hundred ninety thousand, eight hundred eighty-one".