138785757 has 32 divisors (see below), whose sum is σ = 205922304. Its totient is φ = 82444800.

The previous prime is 138785707. The next prime is 138785813. The reversal of 138785757 is 757587831.

It is not a de Polignac number, because 138785757 - 2¹² = 138781661 is a prime.

It is a super-2 number, since 2×138785757² = 38522972692126098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138785707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 611278 + ... + 611504.

It is an arithmetic number, because the mean of its divisors is an integer number (6435072).

Almost surely, 2^138785757 is an apocalyptic number.

It is an amenable number.

138785757 is a deficient number, since it is larger than the sum of its proper divisors (67136547).

138785757 is a wasteful number, since it uses less digits than its factorization.

138785757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529.

The product of its digits is 1646400, while the sum is 51.

The square root of 138785757 is about 11780.7366917354. The cubic root of 138785757 is about 517.7438706824.

The spelling of 138785757 in words is "one hundred thirty-eight million, seven hundred eighty-five thousand, seven hundred fifty-seven".