138652780 has 24 divisors (see below), whose sum is σ = 332767008. Its totient is φ = 47538048.

The previous prime is 138652771. The next prime is 138652793. The reversal of 138652780 is 87256831.

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, 495049 + ... + 495328.

It is an arithmetic number, because the mean of its divisors is an integer number (13865292).

Almost surely, 2^138652780 is an apocalyptic number.

138652780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138652780 is an abundant number, since it is smaller than the sum of its proper divisors (194114228).

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

138652780 is a wasteful number, since it uses less digits than its factorization.

138652780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990393 (or 990391 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 138652780 is about 11775.0915070754. The cubic root of 138652780 is about 517.5784597913.

The spelling of 138652780 in words is "one hundred thirty-eight million, six hundred fifty-two thousand, seven hundred eighty".