1272841920 has 336 divisors, whose sum is σ = 5268407040. Its totient is φ = 275539968.

The previous prime is 1272841903. The next prime is 1272841931. The reversal of 1272841920 is 291482721.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 381379 + ... + 384701.

Almost surely, 2^1272841920 is an apocalyptic number.

1272841920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1272841920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2634203520).

1272841920 is an abundant number, since it is smaller than the sum of its proper divisors (3995565120).

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

1272841920 is a wasteful number, since it uses less digits than its factorization.

1272841920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372 (or 3359 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1272841920 is about 35676.9101801151. The cubic root of 1272841920 is about 1083.7393017865.

The spelling of 1272841920 in words is "one billion, two hundred seventy-two million, eight hundred forty-one thousand, nine hundred twenty".