1272440 has 32 divisors (see below), whose sum is σ = 3084480. Its totient is φ = 469632.

The previous prime is 1272421. The next prime is 1272443. The reversal of 1272440 is 442721.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (96390).

2^1272440 is an apocalyptic number.

1272440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272440 is an abundant number, since it is smaller than the sum of its proper divisors (1812040).

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

1272440 is a wasteful number, since it uses less digits than its factorization.

1272440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471 (or 2467 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1272440 is about 1128.0248224219. The cubic root of 1272440 is about 108.3625220494.

The spelling of 1272440 in words is "one million, two hundred seventy-two thousand, four hundred forty".