138428442 has 24 divisors (see below), whose sum is σ = 306311616. Its totient is φ = 45160776.

The previous prime is 138428441. The next prime is 138428443. The reversal of 138428442 is 244824831.

It is an interprime number because it is at equal distance from previous prime (138428441) and next prime (138428443).

It is a junction number, because it is equal to n+sod(n) for n = 138428397 and 138428406.

It is not an unprimeable number, because it can be changed into a prime (138428441) 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, 80968 + ... + 82659.

It is an arithmetic number, because the mean of its divisors is an integer number (12762984).

Almost surely, 2^138428442 is an apocalyptic number.

138428442 is an abundant number, since it is smaller than the sum of its proper divisors (167883174).

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

138428442 is a wasteful number, since it uses less digits than its factorization.

138428442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163682 (or 163679 counting only the distinct ones).

The product of its digits is 49152, while the sum is 36.

The square root of 138428442 is about 11765.5616950488. The cubic root of 138428442 is about 517.2991645243.

The spelling of 138428442 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, four hundred forty-two".