1240581 has 4 divisors (see below), whose sum is σ = 1654112. Its totient is φ = 827052.

The previous prime is 1240559. The next prime is 1240607. The reversal of 1240581 is 1850421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1240581 - 2⁶ = 1240517 is a prime.

It is a super-2 number, since 2×1240581² = 3078082435122, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206761 + ... + 206766.

It is an arithmetic number, because the mean of its divisors is an integer number (413528).

2^1240581 is an apocalyptic number.

It is an amenable number.

1240581 is a deficient number, since it is larger than the sum of its proper divisors (413531).

1240581 is an equidigital number, since it uses as much as digits as its factorization.

1240581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413530.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1240581 is about 1113.8137187160. The cubic root of 1240581 is about 107.4504837757.

The spelling of 1240581 in words is "one million, two hundred forty thousand, five hundred eighty-one".