1272851220 has 24 divisors (see below), whose sum is σ = 3563983584. Its totient is φ = 339426976.

The previous prime is 1272851207. The next prime is 1272851243. The reversal of 1272851220 is 221582721.

1272851220 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, 10607034 + ... + 10607153.

It is an arithmetic number, because the mean of its divisors is an integer number (148499316).

Almost surely, 2^1272851220 is an apocalyptic number.

1272851220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272851220 is an abundant number, since it is smaller than the sum of its proper divisors (2291132364).

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

1272851220 is a wasteful number, since it uses less digits than its factorization.

1272851220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21214199 (or 21214197 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 1272851220 is about 35677.0405162760. The cubic root of 1272851220 is about 1083.7419412216.

The spelling of 1272851220 in words is "one billion, two hundred seventy-two million, eight hundred fifty-one thousand, two hundred twenty".