1662649 has 4 divisors (see below), whose sum is σ = 1665664. Its totient is φ = 1659636.

The previous prime is 1662643. The next prime is 1662653. The reversal of 1662649 is 9462661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1662649 - 2³ = 1662641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662641) 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, 417 + ... + 1870.

It is an arithmetic number, because the mean of its divisors is an integer number (416416).

2^1662649 is an apocalyptic number.

It is an amenable number.

1662649 is a deficient number, since it is larger than the sum of its proper divisors (3015).

1662649 is an equidigital number, since it uses as much as digits as its factorization.

1662649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014.

The product of its digits is 15552, while the sum is 34.

The square root of 1662649 is about 1289.4374742499. The cubic root of 1662649 is about 118.4677640837.

The spelling of 1662649 in words is "one million, six hundred sixty-two thousand, six hundred forty-nine".