1290440 has 16 divisors (see below), whose sum is σ = 2903580. Its totient is φ = 516160.

The previous prime is 1290439. The next prime is 1290463. The reversal of 1290440 is 440921.

It can be written as a sum of positive squares in 2 ways, for example, as 1170724 + 119716 = 1082^2 + 346^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16091 + ... + 16170.

2^1290440 is an apocalyptic number.

1290440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1290440 is an abundant number, since it is smaller than the sum of its proper divisors (1613140).

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

1290440 is a wasteful number, since it uses less digits than its factorization.

1290440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32272 (or 32268 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1290440 is about 1135.9753518453. The cubic root of 1290440 is about 108.8710986408.

The spelling of 1290440 in words is "one million, two hundred ninety thousand, four hundred forty".