1251832220 has 12 divisors (see below), whose sum is σ = 2628847704. Its totient is φ = 500732880.

The previous prime is 1251832217. The next prime is 1251832237. The reversal of 1251832220 is 222381521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251832220.

It is a congruent number.

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, 31295786 + ... + 31295825.

It is an arithmetic number, because the mean of its divisors is an integer number (219070642).

Almost surely, 2^1251832220 is an apocalyptic number.

1251832220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251832220 is an abundant number, since it is smaller than the sum of its proper divisors (1377015484).

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

1251832220 is a wasteful number, since it uses less digits than its factorization.

1251832220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62591620 (or 62591618 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1251832220 is about 35381.2410748973. The cubic root of 1251832220 is about 1077.7434078465.

The spelling of 1251832220 in words is "one billion, two hundred fifty-one million, eight hundred thirty-two thousand, two hundred twenty".