1280740 has 12 divisors (see below), whose sum is σ = 2689596. Its totient is φ = 512288.

The previous prime is 1280737. The next prime is 1280743. The reversal of 1280740 is 470821.

It is an interprime number because it is at equal distance from previous prime (1280737) and next prime (1280743).

It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 1094116 = 432^2 + 1046^2 .

It is not an unprimeable number, because it can be changed into a prime (1280743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31999 + ... + 32038.

It is an arithmetic number, because the mean of its divisors is an integer number (224133).

2^1280740 is an apocalyptic number.

1280740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280740 is an abundant number, since it is smaller than the sum of its proper divisors (1408856).

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

1280740 is a wasteful number, since it uses less digits than its factorization.

1280740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64046 (or 64044 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 1280740 is about 1131.6978395314. The cubic root of 1280740 is about 108.5976242687.

The spelling of 1280740 in words is "one million, two hundred eighty thousand, seven hundred forty".