138553750 has 40 divisors (see below), whose sum is σ = 261478800. Its totient is φ = 55044000.

The previous prime is 138553747. The next prime is 138553769. The reversal of 138553750 is 57355831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 248472 + ... + 249028.

It is an arithmetic number, because the mean of its divisors is an integer number (6536970).

Almost surely, 2^138553750 is an apocalyptic number.

138553750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138553750 is a deficient number, since it is larger than the sum of its proper divisors (122925050).

138553750 is an equidigital number, since it uses as much as digits as its factorization.

138553750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 138553750 is about 11770.8856930989. The cubic root of 138553750 is about 517.4552070575.

The spelling of 138553750 in words is "one hundred thirty-eight million, five hundred fifty-three thousand, seven hundred fifty".