1261490 has 16 divisors (see below), whose sum is σ = 2295000. Its totient is φ = 499200.

The previous prime is 1261489. The next prime is 1261523. The reversal of 1261490 is 941621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1203409 + 58081 = 1097^2 + 241^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386 + ... + 1634.

2^1261490 is an apocalyptic number.

1261490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261490 is a deficient number, since it is larger than the sum of its proper divisors (1033510).

1261490 is a wasteful number, since it uses less digits than its factorization.

1261490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1261490 is about 1123.1607186863. The cubic root of 1261490 is about 108.0507877271.

The spelling of 1261490 in words is "one million, two hundred sixty-one thousand, four hundred ninety".