138479290 has 8 divisors (see below), whose sum is σ = 249262740. Its totient is φ = 55391712.

The previous prime is 138479273. The next prime is 138479291. The reversal of 138479290 is 92974831.

It can be written as a sum of positive squares in 2 ways, for example, as 138274081 + 205209 = 11759^2 + 453^2 .

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

It is not an unprimeable number, because it can be changed into a prime (138479291) 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, 6923955 + ... + 6923974.

Almost surely, 2^138479290 is an apocalyptic number.

138479290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138479290 is a deficient number, since it is larger than the sum of its proper divisors (110783450).

138479290 is a wasteful number, since it uses less digits than its factorization.

138479290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13847936.

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

The square root of 138479290 is about 11767.7223794581. The cubic root of 138479290 is about 517.3624954592.

The spelling of 138479290 in words is "one hundred thirty-eight million, four hundred seventy-nine thousand, two hundred ninety".