1662523 has 4 divisors (see below), whose sum is σ = 1678768. Its totient is φ = 1646280.

The previous prime is 1662517. The next prime is 1662527. The reversal of 1662523 is 3252661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1662523 - 2⁵ = 1662491 is a prime.

It is a Duffinian number.

1662523 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1662527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7968 + ... + 8173.

It is an arithmetic number, because the mean of its divisors is an integer number (419692).

2^1662523 is an apocalyptic number.

1662523 is a deficient number, since it is larger than the sum of its proper divisors (16245).

1662523 is a wasteful number, since it uses less digits than its factorization.

1662523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16244.

The product of its digits is 2160, while the sum is 25.

The square root of 1662523 is about 1289.3886148094. The cubic root of 1662523 is about 118.4647714065.

It can be divided in two parts, 16625 and 23, that multiplied together give a triangular number (382375 = T₈₇₄).

The spelling of 1662523 in words is "one million, six hundred sixty-two thousand, five hundred twenty-three".