139811840 has 176 divisors, whose sum is σ = 396168192. Its totient is φ = 46350336.

The previous prime is 139811839. The next prime is 139811879. The reversal of 139811840 is 48118931.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 139811840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1684439 + ... + 1684521.

Almost surely, 2^139811840 is an apocalyptic number.

139811840 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 139811840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198084096).

139811840 is an abundant number, since it is smaller than the sum of its proper divisors (256356352).

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

139811840 is an equidigital number, since it uses as much as digits as its factorization.

139811840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 139811840 is about 11824.2056815669. The cubic root of 139811840 is about 519.0166821560.

The spelling of 139811840 in words is "one hundred thirty-nine million, eight hundred eleven thousand, eight hundred forty".