139409817 has 8 divisors (see below), whose sum is σ = 185955840. Its totient is φ = 92901840.

The previous prime is 139409813. The next prime is 139409839. The reversal of 139409817 is 718904931.

It is a happy number.

139409817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 139409817 - 2² = 139409813 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (139409813) 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, 567 + ... + 16707.

It is an arithmetic number, because the mean of its divisors is an integer number (23244480).

Almost surely, 2^139409817 is an apocalyptic number.

It is an amenable number.

139409817 is a deficient number, since it is larger than the sum of its proper divisors (46546023).

139409817 is a wasteful number, since it uses less digits than its factorization.

139409817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19023.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 139409817 is about 11807.1934429821. The cubic root of 139409817 is about 518.5187344425.

The spelling of 139409817 in words is "one hundred thirty-nine million, four hundred nine thousand, eight hundred seventeen".