1397851 has 8 divisors (see below), whose sum is σ = 1720544. Its totient is φ = 1105920.

The previous prime is 1397839. The next prime is 1397857. The reversal of 1397851 is 1587931.

It is a happy number.

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

It is a 13-Lehmer number, since φ(1397851) divides (1397851-1)¹³.

It is a cyclic number.

It is not a de Polignac number, because 1397851 - 2⁹ = 1397339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1397857) 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, 7590 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (215068).

2^1397851 is an apocalyptic number.

1397851 is a deficient number, since it is larger than the sum of its proper divisors (322693).

1397851 is a wasteful number, since it uses less digits than its factorization.

1397851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15381.

The product of its digits is 7560, while the sum is 34.

The square root of 1397851 is about 1182.3074896151. The cubic root of 1397851 is about 111.8116253113.

The spelling of 1397851 in words is "one million, three hundred ninety-seven thousand, eight hundred fifty-one".