139894992 has 80 divisors (see below), whose sum is σ = 407295360. Its totient is φ = 45964800.

The previous prime is 139894991. The next prime is 139895009. The reversal of 139894992 is 299498931.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139894991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28392 + ... + 32952.

It is an arithmetic number, because the mean of its divisors is an integer number (5091192).

Almost surely, 2^139894992 is an apocalyptic number.

139894992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139894992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203647680).

139894992 is an abundant number, since it is smaller than the sum of its proper divisors (267400368).

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

139894992 is a wasteful number, since it uses less digits than its factorization.

139894992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4649 (or 4637 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 139894992 is about 11827.7213359125. The cubic root of 139894992 is about 519.1195554705.

It can be divided in two parts, 13989 and 4992, that added together give a palindrome (18981).

The spelling of 139894992 in words is "one hundred thirty-nine million, eight hundred ninety-four thousand, nine hundred ninety-two".