1397647 has 4 divisors (see below), whose sum is σ = 1400616. Its totient is φ = 1394680.

The previous prime is 1397633. The next prime is 1397657. The reversal of 1397647 is 7467931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1397647 - 2¹⁹ = 873359 is a prime.

It is a Duffinian number.

1397647 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397657) 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, 604 + ... + 1777.

It is an arithmetic number, because the mean of its divisors is an integer number (350154).

2^1397647 is an apocalyptic number.

1397647 is a deficient number, since it is larger than the sum of its proper divisors (2969).

1397647 is an equidigital number, since it uses as much as digits as its factorization.

1397647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968.

The product of its digits is 31752, while the sum is 37.

The square root of 1397647 is about 1182.2212144941. The cubic root of 1397647 is about 111.8061858472.

The spelling of 1397647 in words is "one million, three hundred ninety-seven thousand, six hundred forty-seven".