1997424 has 120 divisors (see below), whose sum is σ = 6634992. Its totient is φ = 552960.

The previous prime is 1997419. The next prime is 1997431. The reversal of 1997424 is 4247991.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (18144) is a multiple of the sum of its prime divisors (126).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20544 + ... + 20640.

2^1997424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3317496).

1997424 is an abundant number, since it is smaller than the sum of its proper divisors (4637568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997424 is a wasteful number, since it uses less digits than its factorization.

1997424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 126 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 1997424 is about 1413.3025153873. The cubic root of 1997424 is about 125.9379891387.

The spelling of 1997424 in words is "one million, nine hundred ninety-seven thousand, four hundred twenty-four".