138562842 has 64 divisors (see below), whose sum is σ = 310837248. Its totient is φ = 40824000.

The previous prime is 138562807. The next prime is 138562847. The reversal of 138562842 is 248265831.

It is a super-2 number, since 2×138562842² = 38399322366233928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138562842.

It is not an unprimeable number, because it can be changed into a prime (138562847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 511167 + ... + 511437.

It is an arithmetic number, because the mean of its divisors is an integer number (4856832).

Almost surely, 2^138562842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138562842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155418624).

138562842 is an abundant number, since it is smaller than the sum of its proper divisors (172274406).

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

138562842 is a wasteful number, since it uses less digits than its factorization.

138562842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475.

The product of its digits is 92160, while the sum is 39.

The square root of 138562842 is about 11771.2718938949. The cubic root of 138562842 is about 517.4665254083.

The spelling of 138562842 in words is "one hundred thirty-eight million, five hundred sixty-two thousand, eight hundred forty-two".