138461399 has 12 divisors (see below), whose sum is σ = 145805400. Its totient is φ = 131446560.

The previous prime is 138461371. The next prime is 138461423. The reversal of 138461399 is 993164831.

It is not a de Polignac number, because 138461399 - 2⁸ = 138461143 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138461359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49952 + ... + 52650.

It is an arithmetic number, because the mean of its divisors is an integer number (12150450).

Almost surely, 2^138461399 is an apocalyptic number.

138461399 is a deficient number, since it is larger than the sum of its proper divisors (7344001).

138461399 is an equidigital number, since it uses as much as digits as its factorization.

138461399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818 (or 2789 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 138461399 is about 11766.9621823137. The cubic root of 138461399 is about 517.3402140744.

The spelling of 138461399 in words is "one hundred thirty-eight million, four hundred sixty-one thousand, three hundred ninety-nine".