1664442 has 32 divisors (see below), whose sum is σ = 3984960. Its totient is φ = 511920.

The previous prime is 1664437. The next prime is 1664447. The reversal of 1664442 is 2444661.

1664442 is a `hidden beast` number, since 16 + 644 + 4 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1664437) and next prime (1664447).

It is a super-3 number, since 3×1664442³ = 13833346426318316664, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1664447) 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, 484 + ... + 1887.

It is an arithmetic number, because the mean of its divisors is an integer number (124530).

2^1664442 is an apocalyptic number.

1664442 is an abundant number, since it is smaller than the sum of its proper divisors (2320518).

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

1664442 is a wasteful number, since it uses less digits than its factorization.

1664442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395 (or 2389 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 1664442 is about 1290.1325513295. The cubic root of 1664442 is about 118.5103339810.

The spelling of 1664442 in words is "one million, six hundred sixty-four thousand, four hundred forty-two".