139952640 has 80 divisors (see below), whose sum is σ = 447435648. Its totient is φ = 37318656.

The previous prime is 139952633. The next prime is 139952641. The reversal of 139952640 is 46259931.

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

It is not an unprimeable number, because it can be changed into a prime (139952641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432 + ... + 16791.

Almost surely, 2^139952640 is an apocalyptic number.

139952640 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 139952640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223717824).

139952640 is an abundant number, since it is smaller than the sum of its proper divisors (307483008).

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

139952640 is an equidigital number, since it uses as much as digits as its factorization.

139952640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18249 (or 18233 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 139952640 is about 11830.1580716405. The cubic root of 139952640 is about 519.1908520289.

The spelling of 139952640 in words is "one hundred thirty-nine million, nine hundred fifty-two thousand, six hundred forty".