1242664 has 8 divisors (see below), whose sum is σ = 2330010. Its totient is φ = 621328.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242664 is 4662421.

It can be written as a sum of positive squares in only one way, i.e., 917764 + 324900 = 958^2 + 570^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77659 + ... + 77674.

2^1242664 is an apocalyptic number.

It is an amenable number.

1242664 is a deficient number, since it is larger than the sum of its proper divisors (1087346).

1242664 is a wasteful number, since it uses less digits than its factorization.

1242664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155339 (or 155335 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 1242664 is about 1114.7484021070. The cubic root of 1242664 is about 107.5105884649.

The spelling of 1242664 in words is "one million, two hundred forty-two thousand, six hundred sixty-four".