1240653 has 4 divisors (see below), whose sum is σ = 1654208. Its totient is φ = 827100.

The previous prime is 1240637. The next prime is 1240667. The reversal of 1240653 is 3560421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3560421 = 3 ⋅1186807.

It is not a de Polignac number, because 1240653 - 2⁴ = 1240637 is a prime.

It is a D-number.

It is a Duffinian 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 (1240153) 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, 206773 + ... + 206778.

It is an arithmetic number, because the mean of its divisors is an integer number (413552).

2^1240653 is an apocalyptic number.

It is an amenable number.

1240653 is a deficient number, since it is larger than the sum of its proper divisors (413555).

1240653 is an equidigital number, since it uses as much as digits as its factorization.

1240653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413554.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1240653 is about 1113.8460396303. The cubic root of 1240653 is about 107.4525624483.

The spelling of 1240653 in words is "one million, two hundred forty thousand, six hundred fifty-three".