212400505 has 8 divisors (see below), whose sum is σ = 256305600. Its totient is φ = 168970416.

The previous prime is 212400497. The next prime is 212400511. The reversal of 212400505 is 505004212.

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 212400505 - 2³ = 212400497 is a prime.

It is a super-2 number, since 2×212400505² = 90227949048510050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117765 + ... + 119554.

It is an arithmetic number, because the mean of its divisors is an integer number (32038200).

Almost surely, 2^212400505 is an apocalyptic number.

It is an amenable number.

212400505 is a deficient number, since it is larger than the sum of its proper divisors (43905095).

212400505 is a wasteful number, since it uses less digits than its factorization.

212400505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237503.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 212400505 is about 14573.9666872132. The cubic root of 212400505 is about 596.6484476125.

Adding to 212400505 its reverse (505004212), we get a palindrome (717404717).

The spelling of 212400505 in words is "two hundred twelve million, four hundred thousand, five hundred five".