1240890 has 64 divisors (see below), whose sum is σ = 3594240. Its totient is φ = 267840.

The previous prime is 1240861. The next prime is 1240931. The reversal of 1240890 is 980421.

It is a self number, because there is not a number n which added to its sum of digits gives 1240890.

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 31 ways as a sum of consecutive naturals, for example, 3835 + ... + 4145.

It is an arithmetic number, because the mean of its divisors is an integer number (56160).

2^1240890 is an apocalyptic number.

1240890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1240890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1797120).

1240890 is an abundant number, since it is smaller than the sum of its proper divisors (2353350).

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

1240890 is a wasteful number, since it uses less digits than its factorization.

1240890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1240890 is about 1113.9524226824. The cubic root of 1240890 is about 107.4594041775.

The spelling of 1240890 in words is "one million, two hundred forty thousand, eight hundred ninety".