1272420 has 36 divisors (see below), whose sum is σ = 3860220. Its totient is φ = 339264.

The previous prime is 1272409. The next prime is 1272421. The reversal of 1272420 is 242721.

It can be written as a sum of positive squares in 2 ways, for example, as 451584 + 820836 = 672^2 + 906^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1272393 and 1272402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3355 + ... + 3714.

2^1272420 is an apocalyptic number.

1272420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272420 is an abundant number, since it is smaller than the sum of its proper divisors (2587800).

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

1272420 is a wasteful number, since it uses less digits than its factorization.

1272420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7084 (or 7079 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1272420 is about 1128.0159573339. The cubic root of 1272420 is about 108.3619543050.

The spelling of 1272420 in words is "one million, two hundred seventy-two thousand, four hundred twenty".