1646397 has 6 divisors (see below), whose sum is σ = 2378142. Its totient is φ = 1097592.

The previous prime is 1646387. The next prime is 1646413. The reversal of 1646397 is 7936461.

1646397 is a `hidden beast` number, since 1 + 646 + 3 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1279161 + 367236 = 1131^2 + 606^2 .

It is not a de Polignac number, because 1646397 - 2¹⁶ = 1580861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646347) 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 5 ways as a sum of consecutive naturals, for example, 91458 + ... + 91475.

It is an arithmetic number, because the mean of its divisors is an integer number (396357).

2^1646397 is an apocalyptic number.

It is an amenable number.

1646397 is a deficient number, since it is larger than the sum of its proper divisors (731745).

1646397 is a wasteful number, since it uses less digits than its factorization.

1646397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182939 (or 182936 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 1646397 is about 1283.1200255627. The cubic root of 1646397 is about 118.0805014217.

Subtracting 1646397 from its reverse (7936461), we obtain a square (6290064 = 2508²).

It can be divided in two parts, 164 and 6397, that added together give a 8-th power (6561 = 3⁸).

The spelling of 1646397 in words is "one million, six hundred forty-six thousand, three hundred ninety-seven".