139444550 has 48 divisors (see below), whose sum is σ = 297838080. Its totient is φ = 47580960.

The previous prime is 139444549. The next prime is 139444573. The reversal of 139444550 is 55444931.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 139444550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82817 + ... + 84483.

It is an arithmetic number, because the mean of its divisors is an integer number (6204960).

Almost surely, 2^139444550 is an apocalyptic number.

139444550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139444550 is an abundant number, since it is smaller than the sum of its proper divisors (158393530).

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

139444550 is a wasteful number, since it uses less digits than its factorization.

139444550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925 (or 1920 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 139444550 is about 11808.6641920244. The cubic root of 139444550 is about 518.5617926626.

The spelling of 139444550 in words is "one hundred thirty-nine million, four hundred forty-four thousand, five hundred fifty".