1397641 has 8 divisors (see below), whose sum is σ = 1666944. Its totient is φ = 1145760.

The previous prime is 1397633. The next prime is 1397657. The reversal of 1397641 is 1467931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1397641 - 2³ = 1397633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4180 + ... + 4501.

It is an arithmetic number, because the mean of its divisors is an integer number (208368).

2^1397641 is an apocalyptic number.

It is an amenable number.

1397641 is a deficient number, since it is larger than the sum of its proper divisors (269303).

1397641 is an equidigital number, since it uses as much as digits as its factorization.

1397641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8711.

The product of its digits is 4536, while the sum is 31.

The square root of 1397641 is about 1182.2186768953. The cubic root of 1397641 is about 111.8060258549.

The spelling of 1397641 in words is "one million, three hundred ninety-seven thousand, six hundred forty-one".