1662445 has 4 divisors (see below), whose sum is σ = 1994940. Its totient is φ = 1329952.

The previous prime is 1662439. The next prime is 1662449. The reversal of 1662445 is 5442661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 715716 + 946729 = 846^2 + 973^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662445 - 2¹⁷ = 1531373 is a prime.

It is a super-3 number, since 3×1662445³ = 13783614333542313375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166240 + ... + 166249.

It is an arithmetic number, because the mean of its divisors is an integer number (498735).

2^1662445 is an apocalyptic number.

It is an amenable number.

1662445 is a deficient number, since it is larger than the sum of its proper divisors (332495).

1662445 is an equidigital number, since it uses as much as digits as its factorization.

1662445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332494.

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

The square root of 1662445 is about 1289.3583675612. The cubic root of 1662445 is about 118.4629187210.

The spelling of 1662445 in words is "one million, six hundred sixty-two thousand, four hundred forty-five".