139994568 has 120 divisors (see below), whose sum is σ = 456236550. Its totient is φ = 39989376.

The previous prime is 139994567. The next prime is 139994579. The reversal of 139994568 is 865499931.

It can be written as a sum of positive squares in only one way, i.e., 137311524 + 2683044 = 11718^2 + 1638^2 .

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

It is not an unprimeable number, because it can be changed into a prime (139994567) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 29548 + ... + 33956.

Almost surely, 2^139994568 is an apocalyptic number.

139994568 is a gapful number since it is divisible by the number (18) 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 139994568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228118275).

139994568 is an abundant number, since it is smaller than the sum of its proper divisors (316241982).

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

139994568 is a wasteful number, since it uses less digits than its factorization.

139994568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4421 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 139994568 is about 11831.9300200770. The cubic root of 139994568 is about 519.2426944725.

The spelling of 139994568 in words is "one hundred thirty-nine million, nine hundred ninety-four thousand, five hundred sixty-eight".