1249721 has 16 divisors (see below), whose sum is σ = 1487808. Its totient is φ = 1036800.

The previous prime is 1249693. The next prime is 1249727. The reversal of 1249721 is 1279421.

It is a cyclic number.

It is not a de Polignac number, because 1249721 - 2⁶ = 1249657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1249727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7586 + ... + 7748.

It is an arithmetic number, because the mean of its divisors is an integer number (92988).

2^1249721 is an apocalyptic number.

1249721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1249721 is a deficient number, since it is larger than the sum of its proper divisors (238087).

1249721 is a wasteful number, since it uses less digits than its factorization.

1249721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232.

The product of its digits is 1008, while the sum is 26.

The square root of 1249721 is about 1117.9092091937. The cubic root of 1249721 is about 107.7137194082.

The spelling of 1249721 in words is "one million, two hundred forty-nine thousand, seven hundred twenty-one".