215542423 has 8 divisors (see below), whose sum is σ = 220344768. Its totient is φ = 210749184.

The previous prime is 215542387. The next prime is 215542429. The reversal of 215542423 is 324245512.

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

It is a cyclic number.

It is not a de Polignac number, because 215542423 - 2²⁵ = 181987991 is a prime.

It is a super-2 number, since 2×215542423² = 92917072225421858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215542391 and 215542400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215542429) 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, 71515 + ... + 74467.

It is an arithmetic number, because the mean of its divisors is an integer number (27543096).

Almost surely, 2^215542423 is an apocalyptic number.

215542423 is a deficient number, since it is larger than the sum of its proper divisors (4802345).

215542423 is a wasteful number, since it uses less digits than its factorization.

215542423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553.

The product of its digits is 9600, while the sum is 28.

The square root of 215542423 is about 14681.3631179125. The cubic root of 215542423 is about 599.5760180620.

Adding to 215542423 its reverse (324245512), we get a palindrome (539787935).

The spelling of 215542423 in words is "two hundred fifteen million, five hundred forty-two thousand, four hundred twenty-three".