1272840 has 32 divisors (see below), whose sum is σ = 3818880. Its totient is φ = 339392.

The previous prime is 1272833. The next prime is 1272847. The reversal of 1272840 is 482721.

It is an interprime number because it is at equal distance from previous prime (1272833) and next prime (1272847).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1272840.

It is not an unprimeable number, because it can be changed into a prime (1272847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5184 + ... + 5423.

It is an arithmetic number, because the mean of its divisors is an integer number (119340).

2^1272840 is an apocalyptic number.

1272840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272840 is an abundant number, since it is smaller than the sum of its proper divisors (2546040).

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

1272840 is a wasteful number, since it uses less digits than its factorization.

1272840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10621 (or 10617 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 1272840 is about 1128.2021095531. The cubic root of 1272840 is about 108.3738756869.

1272840 divided by its sum of digits (24) gives a palindrome (53035).

It can be divided in two parts, 1272 and 840, that added together give a palindrome (2112).

The spelling of 1272840 in words is "one million, two hundred seventy-two thousand, eight hundred forty".