1972397 has 6 divisors (see below), whose sum is σ = 2294478. Its totient is φ = 1690584.

The previous prime is 1972381. The next prime is 1972417. The reversal of 1972397 is 7932791.

It can be written as a sum of positive squares in only one way, i.e., 1901641 + 70756 = 1379^2 + 266^2 .

It is not a de Polignac number, because 1972397 - 2⁴ = 1972381 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1972397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1972307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20078 + ... + 20175.

It is an arithmetic number, because the mean of its divisors is an integer number (382413).

2^1972397 is an apocalyptic number.

It is an amenable number.

1972397 is a deficient number, since it is larger than the sum of its proper divisors (322081).

1972397 is an equidigital number, since it uses as much as digits as its factorization.

1972397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40267 (or 40260 counting only the distinct ones).

The product of its digits is 23814, while the sum is 38.

The square root of 1972397 is about 1404.4205210691. The cubic root of 1972397 is about 125.4097911020.

The spelling of 1972397 in words is "one million, nine hundred seventy-two thousand, three hundred ninety-seven".