138421758 has 16 divisors (see below), whose sum is σ = 285774336. Its totient is φ = 44652120.

The previous prime is 138421753. The next prime is 138421763. The reversal of 138421758 is 857124831.

It is an interprime number because it is at equal distance from previous prime (138421753) and next prime (138421763).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138421753) 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, 371916 + ... + 372287.

It is an arithmetic number, because the mean of its divisors is an integer number (17860896).

Almost surely, 2^138421758 is an apocalyptic number.

138421758 is an abundant number, since it is smaller than the sum of its proper divisors (147352578).

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

138421758 is a wasteful number, since it uses less digits than its factorization.

138421758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744239.

The product of its digits is 53760, while the sum is 39.

The square root of 138421758 is about 11765.2776422828. The cubic root of 138421758 is about 517.2908384819.

The spelling of 138421758 in words is "one hundred thirty-eight million, four hundred twenty-one thousand, seven hundred fifty-eight".