138420799 has 16 divisors (see below), whose sum is σ = 156748320. Its totient is φ = 121080960.

The previous prime is 138420791. The next prime is 138420823. The reversal of 138420799 is 997024831.

It is not a de Polignac number, because 138420799 - 2³ = 138420791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138420791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126097 + ... + 127189.

It is an arithmetic number, because the mean of its divisors is an integer number (9796770).

Almost surely, 2^138420799 is an apocalyptic number.

138420799 is a deficient number, since it is larger than the sum of its proper divisors (18327521).

138420799 is a wasteful number, since it uses less digits than its factorization.

138420799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 138420799 is about 11765.2368866929. The cubic root of 138420799 is about 517.2896438646.

The spelling of 138420799 in words is "one hundred thirty-eight million, four hundred twenty thousand, seven hundred ninety-nine".