1396651 has 4 divisors (see below), whose sum is σ = 1399392. Its totient is φ = 1393912.

The previous prime is 1396627. The next prime is 1396657. The reversal of 1396651 is 1566931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1566931 = 317 ⋅4943.

It is a cyclic number.

It is not a de Polignac number, because 1396651 - 2⁷ = 1396523 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

1396651 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1396657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355 + ... + 1708.

It is an arithmetic number, because the mean of its divisors is an integer number (349848).

2^1396651 is an apocalyptic number.

1396651 is a deficient number, since it is larger than the sum of its proper divisors (2741).

1396651 is an equidigital number, since it uses as much as digits as its factorization.

1396651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740.

The product of its digits is 4860, while the sum is 31.

The square root of 1396651 is about 1181.7998984600. The cubic root of 1396651 is about 111.7796208600.

The spelling of 1396651 in words is "one million, three hundred ninety-six thousand, six hundred fifty-one".