1397680 has 20 divisors (see below), whose sum is σ = 3249792. Its totient is φ = 559040.

The previous prime is 1397657. The next prime is 1397681. The reversal of 1397680 is 867931.

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 8656 + ... + 8815.

2^1397680 is an apocalyptic number.

1397680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1397680 is an abundant number, since it is smaller than the sum of its proper divisors (1852112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1397680 is a wasteful number, since it uses less digits than its factorization.

1397680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17484 (or 17478 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1397680 is about 1182.2351711906. The cubic root of 1397680 is about 111.8070657964.

The spelling of 1397680 in words is "one million, three hundred ninety-seven thousand, six hundred eighty".