139537944 has 256 divisors, whose sum is σ = 494592000. Its totient is φ = 35458560.

The previous prime is 139537939. The next prime is 139537949. The reversal of 139537944 is 449735931.

It is an interprime number because it is at equal distance from previous prime (139537939) and next prime (139537949).

It is a self number, because there is not a number n which added to its sum of digits gives 139537944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139537949) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 609222 + ... + 609450.

It is an arithmetic number, because the mean of its divisors is an integer number (1932000).

Almost surely, 2^139537944 is an apocalyptic number.

139537944 is a gapful number since it is divisible by the number (14) 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 139537944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247296000).

139537944 is an abundant number, since it is smaller than the sum of its proper divisors (355054056).

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

139537944 is a wasteful number, since it uses less digits than its factorization.

139537944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 285 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 139537944 is about 11812.6179994106. The cubic root of 139537944 is about 518.6775370017.

The spelling of 139537944 in words is "one hundred thirty-nine million, five hundred thirty-seven thousand, nine hundred forty-four".