139662409 has 8 divisors (see below), whose sum is σ = 147521792. Its totient is φ = 132012720.

The previous prime is 139662403. The next prime is 139662433. The reversal of 139662409 is 904266931.

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 139662409 - 2³ = 139662401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139662401) 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, 51054 + ... + 53719.

It is an arithmetic number, because the mean of its divisors is an integer number (18440224).

Almost surely, 2^139662409 is an apocalyptic number.

It is an amenable number.

139662409 is a deficient number, since it is larger than the sum of its proper divisors (7859383).

139662409 is a wasteful number, since it uses less digits than its factorization.

139662409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104847.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 139662409 is about 11817.8851322900. The cubic root of 139662409 is about 518.8317077664.

The spelling of 139662409 in words is "one hundred thirty-nine million, six hundred sixty-two thousand, four hundred nine".