138849744 has 160 divisors (see below), whose sum is σ = 428544000. Its totient is φ = 38246400.

The previous prime is 138849707. The next prime is 138849751. The reversal of 138849744 is 447948831.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 138849693 and 138849702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278007 + ... + 278505.

It is an arithmetic number, because the mean of its divisors is an integer number (2678400).

Almost surely, 2^138849744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138849744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214272000).

138849744 is an abundant number, since it is smaller than the sum of its proper divisors (289694256).

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

138849744 is a wasteful number, since it uses less digits than its factorization.

138849744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 563 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 138849744 is about 11783.4521257567. The cubic root of 138849744 is about 517.8234268456.

The spelling of 138849744 in words is "one hundred thirty-eight million, eight hundred forty-nine thousand, seven hundred forty-four".