1397947 has 4 divisors (see below), whose sum is σ = 1400320. Its totient is φ = 1395576.

The previous prime is 1397939. The next prime is 1397951. The reversal of 1397947 is 7497931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1397947 - 2³ = 1397939 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1397447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454 + ... + 1732.

It is an arithmetic number, because the mean of its divisors is an integer number (350080).

2^1397947 is an apocalyptic number.

1397947 is a deficient number, since it is larger than the sum of its proper divisors (2373).

1397947 is a wasteful number, since it uses less digits than its factorization.

1397947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372.

The product of its digits is 47628, while the sum is 40.

The square root of 1397947 is about 1182.3480874937. The cubic root of 1397947 is about 111.8141848761.

The spelling of 1397947 in words is "one million, three hundred ninety-seven thousand, nine hundred forty-seven".