1397491 has 2 divisors, whose sum is σ = 1397492. Its totient is φ = 1397490.

The previous prime is 1397483. The next prime is 1397497. The reversal of 1397491 is 1947931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1397491 - 2³ = 1397483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1397497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698745 + 698746.

It is an arithmetic number, because the mean of its divisors is an integer number (698746).

2^1397491 is an apocalyptic number.

1397491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397491 is an equidigital number, since it uses as much as digits as its factorization.

1397491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 34.

The square root of 1397491 is about 1182.1552351532. The cubic root of 1397491 is about 111.8020258998.

The spelling of 1397491 in words is "one million, three hundred ninety-seven thousand, four hundred ninety-one".