138772262 has 4 divisors (see below), whose sum is σ = 208158396. Its totient is φ = 69386130.

The previous prime is 138772261. The next prime is 138772267. The reversal of 138772262 is 262277831.

138772262 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 262277831 = 73 ⋅3592847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138772261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34693064 + ... + 34693067.

It is an arithmetic number, because the mean of its divisors is an integer number (52039599).

Almost surely, 2^138772262 is an apocalyptic number.

138772262 is a deficient number, since it is larger than the sum of its proper divisors (69386134).

138772262 is an equidigital number, since it uses as much as digits as its factorization.

138772262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69386133.

The product of its digits is 56448, while the sum is 38.

The square root of 138772262 is about 11780.1639207610. The cubic root of 138772262 is about 517.7270889891.

The spelling of 138772262 in words is "one hundred thirty-eight million, seven hundred seventy-two thousand, two hundred sixty-two".