138326479 has 4 divisors (see below), whose sum is σ = 145606840. Its totient is φ = 131046120.

The previous prime is 138326477. The next prime is 138326533. The reversal of 138326479 is 974623831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138326479 - 2¹ = 138326477 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 (138326473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3640152 + ... + 3640189.

It is an arithmetic number, because the mean of its divisors is an integer number (36401710).

Almost surely, 2^138326479 is an apocalyptic number.

138326479 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138326479 is a deficient number, since it is larger than the sum of its proper divisors (7280361).

138326479 is an equidigital number, since it uses as much as digits as its factorization.

138326479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7280360.

The product of its digits is 217728, while the sum is 43.

The square root of 138326479 is about 11761.2277845470. The cubic root of 138326479 is about 517.1721233624.

The spelling of 138326479 in words is "one hundred thirty-eight million, three hundred twenty-six thousand, four hundred seventy-nine".