1273640 has 32 divisors (see below), whose sum is σ = 3035880. Its totient is φ = 479232.

The previous prime is 1273639. The next prime is 1273663. The reversal of 1273640 is 463721.

It can be written as a sum of positive squares in 4 ways, for example, as 835396 + 438244 = 914^2 + 662^2 .

It is an unprimeable number.

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, 257 + ... + 1616.

2^1273640 is an apocalyptic number.

1273640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273640 is an abundant number, since it is smaller than the sum of its proper divisors (1762240).

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

1273640 is a wasteful number, since it uses less digits than its factorization.

1273640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1273640 is about 1128.5566002642. The cubic root of 1273640 is about 108.3965758281.

The spelling of 1273640 in words is "one million, two hundred seventy-three thousand, six hundred forty".