1997290 has 8 divisors (see below), whose sum is σ = 3595140. Its totient is φ = 798912.

The previous prime is 1997269. The next prime is 1997293. The reversal of 1997290 is 927991.

It can be written as a sum of positive squares in 2 ways, for example, as 1879641 + 117649 = 1371^2 + 343^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1997293) 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, 99855 + ... + 99874.

2^1997290 is an apocalyptic number.

1997290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997290 is a deficient number, since it is larger than the sum of its proper divisors (1597850).

1997290 is a wasteful number, since it uses less digits than its factorization.

1997290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199736.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 1997290 is about 1413.2551078981. The cubic root of 1997290 is about 125.9351728333.

The spelling of 1997290 in words is "one million, nine hundred ninety-seven thousand, two hundred ninety".