138407397 has 8 divisors (see below), whose sum is σ = 186766944. Its totient is φ = 91159728.

The previous prime is 138407377. The next prime is 138407407. The reversal of 138407397 is 793704831.

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

It is not a de Polignac number, because 138407397 - 2¹¹ = 138405349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138407317) 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, 277678 + ... + 278175.

It is an arithmetic number, because the mean of its divisors is an integer number (23345868).

Almost surely, 2^138407397 is an apocalyptic number.

It is an amenable number.

138407397 is a deficient number, since it is larger than the sum of its proper divisors (48359547).

138407397 is an equidigital number, since it uses as much as digits as its factorization.

138407397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555939.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 138407397 is about 11764.6673136132. The cubic root of 138407397 is about 517.2729485423.

The spelling of 138407397 in words is "one hundred thirty-eight million, four hundred seven thousand, three hundred ninety-seven".