1664742 has 32 divisors (see below), whose sum is σ = 3715200. Its totient is φ = 494208.

The previous prime is 1664713. The next prime is 1664771. The reversal of 1664742 is 2474661.

It is an interprime number because it is at equal distance from previous prime (1664713) and next prime (1664771).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1509 + ... + 2367.

It is an arithmetic number, because the mean of its divisors is an integer number (116100).

2^1664742 is an apocalyptic number.

1664742 is an abundant number, since it is smaller than the sum of its proper divisors (2050458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664742 is a wasteful number, since it uses less digits than its factorization.

1664742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900.

The product of its digits is 8064, while the sum is 30.

The square root of 1664742 is about 1290.2488132139. The cubic root of 1664742 is about 118.5174536773.

The spelling of 1664742 in words is "one million, six hundred sixty-four thousand, seven hundred forty-two".