1646542 has 4 divisors (see below), whose sum is σ = 2469816. Its totient is φ = 823270.

The previous prime is 1646527. The next prime is 1646543. The reversal of 1646542 is 2456461.

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

It is a super-2 number, since 2×1646542² = 5422201115528, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1646542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646543) 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 as a sum of consecutive naturals, namely, 411634 + ... + 411637.

It is an arithmetic number, because the mean of its divisors is an integer number (617454).

2^1646542 is an apocalyptic number.

1646542 is a deficient number, since it is larger than the sum of its proper divisors (823274).

1646542 is an equidigital number, since it uses as much as digits as its factorization.

1646542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823273.

The product of its digits is 5760, while the sum is 28.

The square root of 1646542 is about 1283.1765272167. The cubic root of 1646542 is about 118.0839678133.

The spelling of 1646542 in words is "one million, six hundred forty-six thousand, five hundred forty-two".