1231290 has 24 divisors (see below), whose sum is σ = 3201588. Its totient is φ = 328320.

The previous prime is 1231283. The next prime is 1231301. The reversal of 1231290 is 921321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1185921 + 45369 = 1089^2 + 213^2 .

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

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 11 ways as a sum of consecutive naturals, for example, 6751 + ... + 6930.

2^1231290 is an apocalyptic number.

1231290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231290 is an abundant number, since it is smaller than the sum of its proper divisors (1970298).

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

1231290 is a wasteful number, since it uses less digits than its factorization.

1231290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13694 (or 13691 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1231290 is about 1109.6350751486. The cubic root of 1231290 is about 107.1815707719.

It can be divided in two parts, 1231 and 290, that added together give a square (1521 = 39²).

The spelling of 1231290 in words is "one million, two hundred thirty-one thousand, two hundred ninety".