1397997 has 6 divisors (see below), whose sum is σ = 2019342. Its totient is φ = 931992.

The previous prime is 1397989. The next prime is 1397999. The reversal of 1397997 is 7997931.

It can be written as a sum of positive squares in only one way, i.e., 1313316 + 84681 = 1146^2 + 291^2 .

It is not a de Polignac number, because 1397997 - 2³ = 1397989 is a prime.

It is a super-2 number, since 2×1397997² = 3908791224018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77658 + ... + 77675.

It is an arithmetic number, because the mean of its divisors is an integer number (336557).

2^1397997 is an apocalyptic number.

It is an amenable number.

1397997 is a deficient number, since it is larger than the sum of its proper divisors (621345).

1397997 is a wasteful number, since it uses less digits than its factorization.

1397997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155339 (or 155336 counting only the distinct ones).

The product of its digits is 107163, while the sum is 45.

The square root of 1397997 is about 1182.3692316700. The cubic root of 1397997 is about 111.8155179363.

The spelling of 1397997 in words is "one million, three hundred ninety-seven thousand, nine hundred ninety-seven".