1272170820 has 24 divisors (see below), whose sum is σ = 3562078464. Its totient is φ = 339245536.

The previous prime is 1272170813. The next prime is 1272170849. The reversal of 1272170820 is 280712721.

It is a happy number.

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

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, 10601364 + ... + 10601483.

It is an arithmetic number, because the mean of its divisors is an integer number (148419936).

Almost surely, 2^1272170820 is an apocalyptic number.

1272170820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272170820 is an abundant number, since it is smaller than the sum of its proper divisors (2289907644).

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

1272170820 is a wasteful number, since it uses less digits than its factorization.

1272170820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21202859 (or 21202857 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 1272170820 is about 35667.5036973433. The cubic root of 1272170820 is about 1083.5488027956.

The spelling of 1272170820 in words is "one billion, two hundred seventy-two million, one hundred seventy thousand, eight hundred twenty".