1237997 has 4 divisors (see below), whose sum is σ = 1259040. Its totient is φ = 1216956.

The previous prime is 1237993. The next prime is 1238023. The reversal of 1237997 is 7997321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7997321 = 67 ⋅119363.

It is a cyclic number.

It is not a de Polignac number, because 1237997 - 2² = 1237993 is a prime.

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 1237997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1237993) by changing a digit.

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, 10433 + ... + 10550.

It is an arithmetic number, because the mean of its divisors is an integer number (314760).

2^1237997 is an apocalyptic number.

It is an amenable number.

1237997 is a deficient number, since it is larger than the sum of its proper divisors (21043).

1237997 is an equidigital number, since it uses as much as digits as its factorization.

1237997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21042.

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

The square root of 1237997 is about 1112.6531355279. The cubic root of 1237997 is about 107.3758292262.

The spelling of 1237997 in words is "one million, two hundred thirty-seven thousand, nine hundred ninety-seven".