2145667 has 4 divisors (see below), whose sum is σ = 2203696. Its totient is φ = 2087640.

The previous prime is 2145643. The next prime is 2145677. The reversal of 2145667 is 7665412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145667 is a prime.

It is a Duffinian number.

2145667 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2145617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28959 + ... + 29032.

It is an arithmetic number, because the mean of its divisors is an integer number (550924).

2^2145667 is an apocalyptic number.

2145667 is a deficient number, since it is larger than the sum of its proper divisors (58029).

2145667 is an equidigital number, since it uses as much as digits as its factorization.

2145667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58028.

The product of its digits is 10080, while the sum is 31.

The square root of 2145667 is about 1464.8095439340. The cubic root of 2145667 is about 128.9795252243.

The spelling of 2145667 in words is "two million, one hundred forty-five thousand, six hundred sixty-seven".