138407407 has 2 divisors, whose sum is σ = 138407408. Its totient is φ = 138407406.

The previous prime is 138407377. The next prime is 138407453. The reversal of 138407407 is 704704831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138407407 - 2⁷ = 138407279 is a prime.

It is a super-2 number, since 2×138407407² = 38313220624927298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138407207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69203703 + 69203704.

It is an arithmetic number, because the mean of its divisors is an integer number (69203704).

Almost surely, 2^138407407 is an apocalyptic number.

138407407 is a deficient number, since it is larger than the sum of its proper divisors (1).

138407407 is an equidigital number, since it uses as much as digits as its factorization.

138407407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 138407407 is about 11764.6677386146. The cubic root of 138407407 is about 517.2729610000.

The spelling of 138407407 in words is "one hundred thirty-eight million, four hundred seven thousand, four hundred seven".