138042996 has 72 divisors (see below), whose sum is σ = 403532640. Its totient is φ = 36404928.

The previous prime is 138042977. The next prime is 138042997. The reversal of 138042996 is 699240831.

138042996 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138042997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1386 + ... + 16673.

It is an arithmetic number, because the mean of its divisors is an integer number (5604620).

Almost surely, 2^138042996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138042996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201766320).

138042996 is an abundant number, since it is smaller than the sum of its proper divisors (265489644).

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

138042996 is a wasteful number, since it uses less digits than its factorization.

138042996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18093 (or 18084 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 138042996 is about 11749.1700132392. The cubic root of 138042996 is about 516.8185883223.

The spelling of 138042996 in words is "one hundred thirty-eight million, forty-two thousand, nine hundred ninety-six".