1664526 has 8 divisors (see below), whose sum is σ = 3329064. Its totient is φ = 554840.

The previous prime is 1664501. The next prime is 1664543. The reversal of 1664526 is 6254661.

It is a sphenic number, since it is the product of 3 distinct primes.

1664526 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1664493 and 1664502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138705 + ... + 138716.

It is an arithmetic number, because the mean of its divisors is an integer number (416133).

2^1664526 is an apocalyptic number.

1664526 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1664526 is a wasteful number, since it uses less digits than its factorization.

1664526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277426.

The product of its digits is 8640, while the sum is 30.

The square root of 1664526 is about 1290.1651057132. The cubic root of 1664526 is about 118.5123275822.

The spelling of 1664526 in words is "one million, six hundred sixty-four thousand, five hundred twenty-six".