1997428 has 12 divisors (see below), whose sum is σ = 3519712. Its totient is φ = 991800.

The previous prime is 1997419. The next prime is 1997431. The reversal of 1997428 is 8247991.

It is a congruent number.

It is an unprimeable number.

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, 1050 + ... + 2257.

2^1997428 is an apocalyptic number.

It is an amenable number.

1997428 is a deficient number, since it is larger than the sum of its proper divisors (1522284).

1997428 is a wasteful number, since it uses less digits than its factorization.

1997428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3462 (or 3460 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 1997428 is about 1413.3039305118. The cubic root of 1997428 is about 125.9380732056.

It can be divided in two parts, 19974 and 28, that added together give a palindrome (20002).

The spelling of 1997428 in words is "one million, nine hundred ninety-seven thousand, four hundred twenty-eight".