2191427 has 8 divisors (see below), whose sum is σ = 2556000. Its totient is φ = 1878072.

The previous prime is 2191393. The next prime is 2191429. The reversal of 2191427 is 7241912.

It is not a de Polignac number, because 2191427 - 2⁶ = 2191363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2191396 and 2191405.

It is not an unprimeable number, because it can be changed into a prime (2191429) 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, 2852 + ... + 3537.

It is an arithmetic number, because the mean of its divisors is an integer number (319500).

2^2191427 is an apocalyptic number.

2191427 is a deficient number, since it is larger than the sum of its proper divisors (364573).

2191427 is an frugal number, since it uses more digits than its factorization.

2191427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410 (or 6396 counting only the distinct ones).

The product of its digits is 1008, while the sum is 26.

The square root of 2191427 is about 1480.3469187998. The cubic root of 2191427 is about 129.8899858208.

The spelling of 2191427 in words is "two million, one hundred ninety-one thousand, four hundred twenty-seven".