138723402 has 16 divisors (see below), whose sum is σ = 277574400. Its totient is φ = 46219872.

The previous prime is 138723401. The next prime is 138723407. The reversal of 138723402 is 204327831.

It is a self number, because there is not a number n which added to its sum of digits gives 138723402.

It is not an unprimeable number, because it can be changed into a prime (138723401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14503 + ... + 22085.

It is an arithmetic number, because the mean of its divisors is an integer number (17348400).

Almost surely, 2^138723402 is an apocalyptic number.

138723402 is an abundant number, since it is smaller than the sum of its proper divisors (138850998).

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

138723402 is a wasteful number, since it uses less digits than its factorization.

138723402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10637.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 138723402 is about 11778.0899130547. The cubic root of 138723402 is about 517.6663200847. Note that the first 3 decimals are identical.

The spelling of 138723402 in words is "one hundred thirty-eight million, seven hundred twenty-three thousand, four hundred two".