139891240 has 16 divisors (see below), whose sum is σ = 314755380. Its totient is φ = 55956480.

The previous prime is 139891231. The next prime is 139891259. The reversal of 139891240 is 42198931.

It can be written as a sum of positive squares in 2 ways, for example, as 127373796 + 12517444 = 11286^2 + 3538^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139891240.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1748601 + ... + 1748680.

Almost surely, 2^139891240 is an apocalyptic number.

139891240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139891240 is an abundant number, since it is smaller than the sum of its proper divisors (174864140).

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

139891240 is a wasteful number, since it uses less digits than its factorization.

139891240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3497292 (or 3497288 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 139891240 is about 11827.5627244162. The cubic root of 139891240 is about 519.1149144800.

The spelling of 139891240 in words is "one hundred thirty-nine million, eight hundred ninety-one thousand, two hundred forty".