138887793 has 36 divisors (see below), whose sum is σ = 223144740. Its totient is φ = 83170560.

The previous prime is 138887783. The next prime is 138887821. The reversal of 138887793 is 397788831.

It can be written as a sum of positive squares in 2 ways, for example, as 71368704 + 67519089 = 8448^2 + 8217^2 .

It is not a de Polignac number, because 138887793 - 2⁶ = 138887729 is a prime.

Its product of digits (2032128) is a multiple of the sum of its prime divisors (1536).

It is not an unprimeable number, because it can be changed into a prime (138887713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 96205 + ... + 97637.

It is an arithmetic number, because the mean of its divisors is an integer number (6198465).

Almost surely, 2^138887793 is an apocalyptic number.

It is an amenable number.

138887793 is a deficient number, since it is larger than the sum of its proper divisors (84256947).

138887793 is a wasteful number, since it uses less digits than its factorization.

138887793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550 (or 1536 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 138887793 is about 11785.0665250562. The cubic root of 138887793 is about 517.8707222494.

The spelling of 138887793 in words is "one hundred thirty-eight million, eight hundred eighty-seven thousand, seven hundred ninety-three".