139908640 has 48 divisors (see below), whose sum is σ = 349984152. Its totient is φ = 52670464.

The previous prime is 139908631. The next prime is 139908641. The reversal of 139908640 is 46809931.

It can be written as a sum of positive squares in 4 ways, for example, as 139901584 + 7056 = 11828^2 + 84^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 139908593 and 139908602.

It is not an unprimeable number, because it can be changed into a prime (139908641) 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 7 ways as a sum of consecutive naturals, for example, 22999 + ... + 28438.

Almost surely, 2^139908640 is an apocalyptic number.

139908640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139908640 is an abundant number, since it is smaller than the sum of its proper divisors (210075512).

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

139908640 is a wasteful number, since it uses less digits than its factorization.

139908640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51469 (or 51461 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 139908640 is about 11828.2982715182. The cubic root of 139908640 is about 519.1364364973.

The spelling of 139908640 in words is "one hundred thirty-nine million, nine hundred eight thousand, six hundred forty".