215649423 has 48 divisors (see below), whose sum is σ = 363018240. Its totient is φ = 122068800.

The previous prime is 215649409. The next prime is 215649439. The reversal of 215649423 is 324946512.

It is a happy number.

215649423 is a `hidden beast` number, since 2 + 1 + 5 + 649 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 215649423 - 2⁴ = 215649407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215649493) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87790 + ... + 90212.

It is an arithmetic number, because the mean of its divisors is an integer number (7562880).

Almost surely, 2^215649423 is an apocalyptic number.

215649423 is a deficient number, since it is larger than the sum of its proper divisors (147368817).

215649423 is a wasteful number, since it uses less digits than its factorization.

215649423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500 (or 2497 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 215649423 is about 14685.0067415715. The cubic root of 215649423 is about 599.6752158905.

The spelling of 215649423 in words is "two hundred fifteen million, six hundred forty-nine thousand, four hundred twenty-three".