1397990 has 32 divisors (see below), whose sum is σ = 2799360. Its totient is φ = 498400.

The previous prime is 1397989. The next prime is 1397999. The reversal of 1397990 is 997931.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7721 + ... + 7899.

It is an arithmetic number, because the mean of its divisors is an integer number (87480).

2^1397990 is an apocalyptic number.

1397990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1397990 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

1397990 is a wasteful number, since it uses less digits than its factorization.

1397990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 1397990 is about 1182.3662715081. The cubic root of 1397990 is about 111.8153313098.

The spelling of 1397990 in words is "one million, three hundred ninety-seven thousand, nine hundred ninety".