139420944 has 180 divisors, whose sum is σ = 448688916. Its totient is φ = 40255488.

The previous prime is 139420937. The next prime is 139420949. The reversal of 139420944 is 449024931.

It can be written as a sum of positive squares in 6 ways, for example, as 17539344 + 121881600 = 4188^2 + 11040^2 .

It is a super-2 number, since 2×139420944² = 38876399251702272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 139420899 and 139420908.

It is not an unprimeable number, because it can be changed into a prime (139420949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 413544 + ... + 413880.

Almost surely, 2^139420944 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 139420944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224344458).

139420944 is an abundant number, since it is smaller than the sum of its proper divisors (309267972).

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

139420944 is a wasteful number, since it uses less digits than its factorization.

139420944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 139420944 is about 11807.6646293837. The cubic root of 139420944 is about 518.5325292732.

The spelling of 139420944 in words is "one hundred thirty-nine million, four hundred twenty thousand, nine hundred forty-four".