138437771 has 12 divisors (see below), whose sum is σ = 143665032. Its totient is φ = 133320000.

The previous prime is 138437737. The next prime is 138437773. The reversal of 138437771 is 177734831.

It is not a de Polignac number, because 138437771 - 2⁶ = 138437707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138437773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418076 + ... + 418406.

It is an arithmetic number, because the mean of its divisors is an integer number (11972086).

Almost surely, 2^138437771 is an apocalyptic number.

138437771 is a deficient number, since it is larger than the sum of its proper divisors (5227261).

138437771 is an equidigital number, since it uses as much as digits as its factorization.

138437771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 473 counting only the distinct ones).

The product of its digits is 98784, while the sum is 41.

The square root of 138437771 is about 11765.9581420299. The cubic root of 138437771 is about 517.3107849096.

The spelling of 138437771 in words is "one hundred thirty-eight million, four hundred thirty-seven thousand, seven hundred seventy-one".