1275990 has 16 divisors (see below), whose sum is σ = 3062448. Its totient is φ = 340256.

The previous prime is 1275979. The next prime is 1276001. The reversal of 1275990 is 995721.

It is an interprime number because it is at equal distance from previous prime (1275979) and next prime (1276001).

It is a Curzon number.

It is a congruent number.

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, 21237 + ... + 21296.

It is an arithmetic number, because the mean of its divisors is an integer number (191403).

2^1275990 is an apocalyptic number.

1275990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1275990 is an abundant number, since it is smaller than the sum of its proper divisors (1786458).

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

1275990 is a wasteful number, since it uses less digits than its factorization.

1275990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42543.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 1275990 is about 1129.5972733678. The cubic root of 1275990 is about 108.4632025684.

The spelling of 1275990 in words is "one million, two hundred seventy-five thousand, nine hundred ninety".