139967440 has 80 divisors (see below), whose sum is σ = 336853440. Its totient is φ = 54051840.

The previous prime is 139967431. The next prime is 139967447. The reversal of 139967440 is 44769931.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139967447) 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, 455767 + ... + 456073.

It is an arithmetic number, because the mean of its divisors is an integer number (4210668).

Almost surely, 2^139967440 is an apocalyptic number.

139967440 is a gapful number since it is divisible by the number (10) 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 139967440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168426720).

139967440 is an abundant number, since it is smaller than the sum of its proper divisors (196886000).

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

139967440 is a wasteful number, since it uses less digits than its factorization.

139967440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 139967440 is about 11830.7835750638. The cubic root of 139967440 is about 519.2091528717.

The spelling of 139967440 in words is "one hundred thirty-nine million, nine hundred sixty-seven thousand, four hundred forty".