138730770 has 24 divisors (see below), whose sum is σ = 360700236. Its totient is φ = 36994848.

The previous prime is 138730769. The next prime is 138730783. The reversal of 138730770 is 77037831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 136399041 + 2331729 = 11679^2 + 1527^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 770637 + ... + 770816.

Almost surely, 2^138730770 is an apocalyptic number.

138730770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138730770 is an abundant number, since it is smaller than the sum of its proper divisors (221969466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138730770 is a wasteful number, since it uses less digits than its factorization.

138730770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541466 (or 1541463 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 138730770 is about 11778.4026930650. The cubic root of 138730770 is about 517.6754848396.

The spelling of 138730770 in words is "one hundred thirty-eight million, seven hundred thirty thousand, seven hundred seventy".