215454423 has 4 divisors (see below), whose sum is σ = 287272568. Its totient is φ = 143636280.

The previous prime is 215454419. The next prime is 215454431. The reversal of 215454423 is 324454512.

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

It is not a de Polignac number, because 215454423 - 2² = 215454419 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 (215454403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35909068 + ... + 35909073.

It is an arithmetic number, because the mean of its divisors is an integer number (71818142).

Almost surely, 2^215454423 is an apocalyptic number.

215454423 is a deficient number, since it is larger than the sum of its proper divisors (71818145).

215454423 is an equidigital number, since it uses as much as digits as its factorization.

215454423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71818144.

The product of its digits is 19200, while the sum is 30.

The square root of 215454423 is about 14678.3658150354. The cubic root of 215454423 is about 599.4944101957.

The spelling of 215454423 in words is "two hundred fifteen million, four hundred fifty-four thousand, four hundred twenty-three".