1251944220 has 24 divisors (see below), whose sum is σ = 3505443984. Its totient is φ = 333851776.

The previous prime is 1251944179. The next prime is 1251944231. The reversal of 1251944220 is 224491521.

1251944220 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 10432809 + ... + 10432928.

It is an arithmetic number, because the mean of its divisors is an integer number (146060166).

Almost surely, 2^1251944220 is an apocalyptic number.

1251944220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251944220 is an abundant number, since it is smaller than the sum of its proper divisors (2253499764).

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

1251944220 is a wasteful number, since it uses less digits than its factorization.

1251944220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20865749 (or 20865747 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1251944220 is about 35382.8237991260. The cubic root of 1251944220 is about 1077.7755483789.

The spelling of 1251944220 in words is "one billion, two hundred fifty-one million, nine hundred forty-four thousand, two hundred twenty".