139552820 has 24 divisors (see below), whose sum is σ = 319703328. Its totient is φ = 50746400.

The previous prime is 139552783. The next prime is 139552837. The reversal of 139552820 is 28255931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316946 + ... + 317385.

It is an arithmetic number, because the mean of its divisors is an integer number (13320972).

Almost surely, 2^139552820 is an apocalyptic number.

139552820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139552820 is an abundant number, since it is smaller than the sum of its proper divisors (180150508).

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

139552820 is a wasteful number, since it uses less digits than its factorization.

139552820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634351 (or 634349 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 139552820 is about 11813.2476482972. The cubic root of 139552820 is about 518.6959682438.

The spelling of 139552820 in words is "one hundred thirty-nine million, five hundred fifty-two thousand, eight hundred twenty".