138749723 has 12 divisors (see below), whose sum is σ = 169898760. Its totient is φ = 112668192.

The previous prime is 138749719. The next prime is 138749747. The reversal of 138749723 is 327947831.

It is not a de Polignac number, because 138749723 - 2² = 138749719 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (138749753) 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, 73586 + ... + 75447.

It is an arithmetic number, because the mean of its divisors is an integer number (14158230).

Almost surely, 2^138749723 is an apocalyptic number.

138749723 is a deficient number, since it is larger than the sum of its proper divisors (31149037).

138749723 is a wasteful number, since it uses less digits than its factorization.

138749723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149066 (or 149059 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 138749723 is about 11779.2072313887. The cubic root of 138749723 is about 517.6990582129.

The spelling of 138749723 in words is "one hundred thirty-eight million, seven hundred forty-nine thousand, seven hundred twenty-three".