1251090 has 24 divisors (see below), whose sum is σ = 3253068. Its totient is φ = 333600.

The previous prime is 1251083. The next prime is 1251097. The reversal of 1251090 is 901521.

It is an interprime number because it is at equal distance from previous prime (1251083) and next prime (1251097).

It can be written as a sum of positive squares in 2 ways, for example, as 1238769 + 12321 = 1113^2 + 111^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1251097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6861 + ... + 7040.

2^1251090 is an apocalyptic number.

1251090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251090 is an abundant number, since it is smaller than the sum of its proper divisors (2001978).

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

1251090 is a wasteful number, since it uses less digits than its factorization.

1251090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13914 (or 13911 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1251090 is about 1118.5213453484. The cubic root of 1251090 is about 107.7530365224.

The spelling of 1251090 in words is "one million, two hundred fifty-one thousand, ninety".