139499281 has 8 divisors (see below), whose sum is σ = 141494400. Its totient is φ = 137516400.

The previous prime is 139499279. The next prime is 139499303. The reversal of 139499281 is 182994931.

It is a happy number.

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 139499281 - 2¹ = 139499279 is a prime.

It is a super-2 number, since 2×139499281² = 38920098799033922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139499201) 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, 21250 + ... + 27028.

It is an arithmetic number, because the mean of its divisors is an integer number (17686800).

Almost surely, 2^139499281 is an apocalyptic number.

It is an amenable number.

139499281 is a deficient number, since it is larger than the sum of its proper divisors (1995119).

139499281 is a wasteful number, since it uses less digits than its factorization.

139499281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6119.

The product of its digits is 139968, while the sum is 46.

The square root of 139499281 is about 11810.9813732814. The cubic root of 139499281 is about 518.6296277342.

The spelling of 139499281 in words is "one hundred thirty-nine million, four hundred ninety-nine thousand, two hundred eighty-one".