1249665 has 8 divisors (see below), whose sum is σ = 1999488. Its totient is φ = 666480.

The previous prime is 1249657. The next prime is 1249669. The reversal of 1249665 is 5669421.

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

It is not a de Polignac number, because 1249665 - 2³ = 1249657 is a prime.

It is a super-2 number, since 2×1249665² = 3123325224450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1249669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41641 + ... + 41670.

It is an arithmetic number, because the mean of its divisors is an integer number (249936).

2^1249665 is an apocalyptic number.

1249665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1249665 is a deficient number, since it is larger than the sum of its proper divisors (749823).

1249665 is an equidigital number, since it uses as much as digits as its factorization.

1249665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83319.

The product of its digits is 12960, while the sum is 33.

The square root of 1249665 is about 1117.8841621563. The cubic root of 1249665 is about 107.7121105002.

It can be divided in two parts, 12496 and 65, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 1249665 in words is "one million, two hundred forty-nine thousand, six hundred sixty-five".