1264991 has 8 divisors (see below), whose sum is σ = 1557024. Its totient is φ = 1000800.

The previous prime is 1264981. The next prime is 1264997. The reversal of 1264991 is 1994621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264997) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6860 + ... + 7041.

It is an arithmetic number, because the mean of its divisors is an integer number (194628).

2^1264991 is an apocalyptic number.

1264991 is a deficient number, since it is larger than the sum of its proper divisors (292033).

1264991 is a wasteful number, since it uses less digits than its factorization.

1264991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13921.

The product of its digits is 3888, while the sum is 32.

The square root of 1264991 is about 1124.7181869251. The cubic root of 1264991 is about 108.1506528061.

The spelling of 1264991 in words is "one million, two hundred sixty-four thousand, nine hundred ninety-one".