1397278 has 8 divisors (see below), whose sum is σ = 2168280. Its totient is φ = 674520.

The previous prime is 1397267. The next prime is 1397287. The reversal of 1397278 is 8727931.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11988 + ... + 12103.

It is an arithmetic number, because the mean of its divisors is an integer number (271035).

2^1397278 is an apocalyptic number.

1397278 is a deficient number, since it is larger than the sum of its proper divisors (771002).

1397278 is a wasteful number, since it uses less digits than its factorization.

1397278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24122.

The product of its digits is 21168, while the sum is 37.

The square root of 1397278 is about 1182.0651420290. The cubic root of 1397278 is about 111.7963454717.

The spelling of 1397278 in words is "one million, three hundred ninety-seven thousand, two hundred seventy-eight".