1272720 has 40 divisors (see below), whose sum is σ = 3946176. Its totient is φ = 339328.

The previous prime is 1272679. The next prime is 1272749. The reversal of 1272720 is 272721.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam 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, 2412 + ... + 2891.

2^1272720 is an apocalyptic number.

1272720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272720 is an abundant number, since it is smaller than the sum of its proper divisors (2673456).

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

1272720 is a wasteful number, since it uses less digits than its factorization.

1272720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5319 (or 5313 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 1272720 is about 1128.1489263391. The cubic root of 1272720 is about 108.3704698455.

Subtracting from 1272720 its reverse (272721), we obtain a palindrome (999999).

The spelling of 1272720 in words is "one million, two hundred seventy-two thousand, seven hundred twenty".