138481730 has 16 divisors (see below), whose sum is σ = 252683064. Its totient is φ = 54633600.

The previous prime is 138481727. The next prime is 138481753. The reversal of 138481730 is 37184831.

It can be written as a sum of positive squares in 4 ways, for example, as 113571649 + 24910081 = 10657^2 + 4991^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94121 + ... + 95580.

Almost surely, 2^138481730 is an apocalyptic number.

138481730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138481730 is a deficient number, since it is larger than the sum of its proper divisors (114201334).

138481730 is a wasteful number, since it uses less digits than its factorization.

138481730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189781.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 138481730 is about 11767.8260524194. The cubic root of 138481730 is about 517.3655340774.

The spelling of 138481730 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, seven hundred thirty".