138494930 has 32 divisors (see below), whose sum is σ = 285503616. Its totient is φ = 47384064.

The previous prime is 138494927. The next prime is 138494969. The reversal of 138494930 is 39494831.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36482 + ... + 40098.

It is an arithmetic number, because the mean of its divisors is an integer number (8921988).

Almost surely, 2^138494930 is an apocalyptic number.

138494930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138494930 is an abundant number, since it is smaller than the sum of its proper divisors (147008686).

138494930 is a wasteful number, since it uses less digits than its factorization.

138494930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 138494930 is about 11768.3868903091. The cubic root of 138494930 is about 517.3819718849.

Subtracting from 138494930 its reverse (39494831), we obtain a palindrome (99000099).

The spelling of 138494930 in words is "one hundred thirty-eight million, four hundred ninety-four thousand, nine hundred thirty".