138723336 has 48 divisors (see below), whose sum is σ = 384880860. Its totient is φ = 45112320.

The previous prime is 138723331. The next prime is 138723359. The reversal of 138723336 is 633327831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 97891236 + 40832100 = 9894^2 + 6390^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 138723336.

It is not an unprimeable number, because it can be changed into a prime (138723331) 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, 20545 + ... + 26448.

Almost surely, 2^138723336 is an apocalyptic number.

It is an amenable number.

138723336 is an abundant number, since it is smaller than the sum of its proper divisors (246157524).

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

138723336 is a wasteful number, since it uses less digits than its factorization.

138723336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47046 (or 47039 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 138723336 is about 11778.0871112418. The cubic root of 138723336 is about 517.6662379885. Note that the first 3 decimals are identical.

The spelling of 138723336 in words is "one hundred thirty-eight million, seven hundred twenty-three thousand, three hundred thirty-six".