1272780 has 48 divisors (see below), whose sum is σ = 3961440. Its totient is φ = 339264.

The previous prime is 1272749. The next prime is 1272811. The reversal of 1272780 is 872721.

It is an interprime number because it is at equal distance from previous prime (1272749) and next prime (1272811).

It is a hoax number, since the sum of its digits (27) 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 (27).

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 639 + ... + 1718.

It is an arithmetic number, because the mean of its divisors is an integer number (82530).

2^1272780 is an apocalyptic number.

1272780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272780 is an abundant number, since it is smaller than the sum of its proper divisors (2688660).

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

1272780 is a wasteful number, since it uses less digits than its factorization.

1272780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375 (or 2367 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1272780 is about 1128.1755182595. The cubic root of 1272780 is about 108.3721727930.

The spelling of 1272780 in words is "one million, two hundred seventy-two thousand, seven hundred eighty".