1997662 has 4 divisors (see below), whose sum is σ = 2996496. Its totient is φ = 998830.

The previous prime is 1997657. The next prime is 1997663. The reversal of 1997662 is 2667991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2667991 = 1493 ⋅1787.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499414 + ... + 499417.

It is an arithmetic number, because the mean of its divisors is an integer number (749124).

2^1997662 is an apocalyptic number.

1997662 is a deficient number, since it is larger than the sum of its proper divisors (998834).

1997662 is an equidigital number, since it uses as much as digits as its factorization.

1997662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998833.

The product of its digits is 40824, while the sum is 40.

The square root of 1997662 is about 1413.3867128284. The cubic root of 1997662 is about 125.9429909228.

The spelling of 1997662 in words is "one million, nine hundred ninety-seven thousand, six hundred sixty-two".