212404545 has 32 divisors (see below), whose sum is σ = 399824640. Its totient is φ = 106617600.

The previous prime is 212404519. The next prime is 212404547. The reversal of 212404545 is 545404212.

212404545 is a `hidden beast` number, since 212 + 404 + 5 + 45 = 666.

It is not a de Polignac number, because 212404545 - 2⁵ = 212404513 is a prime.

It is a super-3 number, since 3×212404545³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (212404547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43981 + ... + 48570.

It is an arithmetic number, because the mean of its divisors is an integer number (12494520).

Almost surely, 2^212404545 is an apocalyptic number.

It is an amenable number.

212404545 is a deficient number, since it is larger than the sum of its proper divisors (187420095).

212404545 is a wasteful number, since it uses less digits than its factorization.

212404545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92582 (or 92576 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 212404545 is about 14574.1052898626. The cubic root of 212404545 is about 596.6522304730.

Adding to 212404545 its reverse (545404212), we get a palindrome (757808757).

The spelling of 212404545 in words is "two hundred twelve million, four hundred four thousand, five hundred forty-five".