1240989 has 8 divisors (see below), whose sum is σ = 1659840. Its totient is φ = 824736.

The previous prime is 1240979. The next prime is 1240991. The reversal of 1240989 is 9890421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1240989 - 2⁴ = 1240973 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344 + ... + 2070.

It is an arithmetic number, because the mean of its divisors is an integer number (207480).

2^1240989 is an apocalyptic number.

It is an amenable number.

1240989 is a deficient number, since it is larger than the sum of its proper divisors (418851).

1240989 is an equidigital number, since it uses as much as digits as its factorization.

1240989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1240989 is about 1113.9968581643. The cubic root of 1240989 is about 107.4622618571.

The spelling of 1240989 in words is "one million, two hundred forty thousand, nine hundred eighty-nine".