1242644 has 24 divisors (see below), whose sum is σ = 2446080. Its totient is φ = 548064.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242644 is 4462421.

It is a super-2 number, since 2×1242644² = 3088328221472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677 + ... + 1715.

It is an arithmetic number, because the mean of its divisors is an integer number (101920).

2^1242644 is an apocalyptic number.

It is an amenable number.

1242644 is a deficient number, since it is larger than the sum of its proper divisors (1203436).

1242644 is a wasteful number, since it uses less digits than its factorization.

1242644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079 (or 1077 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 1242644 is about 1114.7394314368. The cubic root of 1242644 is about 107.5100116870.

The spelling of 1242644 in words is "one million, two hundred forty-two thousand, six hundred forty-four".