1667397 has 8 divisors (see below), whose sum is σ = 2295040. Its totient is φ = 1075680.

The previous prime is 1667389. The next prime is 1667401. The reversal of 1667397 is 7937661.

1667397 is nontrivially palindromic in base 9.

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

It is not a de Polignac number, because 1667397 - 2³ = 1667389 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 (1667357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8872 + ... + 9057.

It is an arithmetic number, because the mean of its divisors is an integer number (286880).

2^1667397 is an apocalyptic number.

It is an amenable number.

1667397 is a deficient number, since it is larger than the sum of its proper divisors (627643).

1667397 is a wasteful number, since it uses less digits than its factorization.

1667397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17963.

The product of its digits is 47628, while the sum is 39.

The square root of 1667397 is about 1291.2772746393. The cubic root of 1667397 is about 118.5804257390.

The spelling of 1667397 in words is "one million, six hundred sixty-seven thousand, three hundred ninety-seven".