1249663 has 4 divisors (see below), whose sum is σ = 1258200. Its totient is φ = 1241128.

The previous prime is 1249657. The next prime is 1249669. The reversal of 1249663 is 3669421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3669421 = 7 ⋅524203.

It is an interprime number because it is at equal distance from previous prime (1249657) and next prime (1249669).

It is a cyclic number.

It is not a de Polignac number, because 1249663 - 2⁵ = 1249631 is a prime.

It is a super-2 number, since 2×1249663² = 3123315227138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249669) 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, 4045 + ... + 4342.

It is an arithmetic number, because the mean of its divisors is an integer number (314550).

2^1249663 is an apocalyptic number.

1249663 is a deficient number, since it is larger than the sum of its proper divisors (8537).

1249663 is an equidigital number, since it uses as much as digits as its factorization.

1249663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8536.

The product of its digits is 7776, while the sum is 31.

The square root of 1249663 is about 1117.8832676089. The cubic root of 1249663 is about 107.7120530383.

The spelling of 1249663 in words is "one million, two hundred forty-nine thousand, six hundred sixty-three".