139309440 has 192 divisors, whose sum is σ = 464985360. Its totient is φ = 35463168.

The previous prime is 139309439. The next prime is 139309481. The reversal of 139309440 is 44903931.

139309440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×139309440² = 38814240146227200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2628454 + ... + 2628506.

Almost surely, 2^139309440 is an apocalyptic number.

139309440 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 139309440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232492680).

139309440 is an abundant number, since it is smaller than the sum of its proper divisors (325675920).

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

139309440 is an equidigital number, since it uses as much as digits as its factorization.

139309440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 139309440 is about 11802.9420061271. The cubic root of 139309440 is about 518.3942576715.

The spelling of 139309440 in words is "one hundred thirty-nine million, three hundred nine thousand, four hundred forty".