215400023 has 16 divisors (see below), whose sum is σ = 227858400. Its totient is φ = 203333760.

The previous prime is 215400011. The next prime is 215400041. The reversal of 215400023 is 320004512.

It is a cyclic number.

It is not a de Polignac number, because 215400023 - 2¹⁰ = 215398999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215399974 and 215400010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215400223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261953 + ... + 262773.

It is an arithmetic number, because the mean of its divisors is an integer number (14241150).

Almost surely, 2^215400023 is an apocalyptic number.

215400023 is a deficient number, since it is larger than the sum of its proper divisors (12458377).

215400023 is a wasteful number, since it uses less digits than its factorization.

215400023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 215400023 is about 14676.5126307308. The cubic root of 215400023 is about 599.4439505817.

Adding to 215400023 its reverse (320004512), we get a palindrome (535404535).

The spelling of 215400023 in words is "two hundred fifteen million, four hundred thousand, twenty-three".