1397639 has 8 divisors (see below), whose sum is σ = 1444608. Its totient is φ = 1351480.

The previous prime is 1397633. The next prime is 1397657. The reversal of 1397639 is 9367931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397633) 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 7 ways as a sum of consecutive naturals, for example, 6044 + ... + 6270.

It is an arithmetic number, because the mean of its divisors is an integer number (180576).

2^1397639 is an apocalyptic number.

1397639 is a deficient number, since it is larger than the sum of its proper divisors (46969).

1397639 is a wasteful number, since it uses less digits than its factorization.

1397639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its digits is 30618, while the sum is 38.

The square root of 1397639 is about 1182.2178310278. The cubic root of 1397639 is about 111.8059725241.

The spelling of 1397639 in words is "one million, three hundred ninety-seven thousand, six hundred thirty-nine".