212401405 has 8 divisors (see below), whose sum is σ = 255784032. Its totient is φ = 169319568.

The previous prime is 212401363. The next prime is 212401411. The reversal of 212401405 is 504104212.

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 212401405 - 2¹¹ = 212399357 is a prime.

It is a super-2 number, since 2×212401405² = 90228713691948050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 73639 + ... + 76468.

It is an arithmetic number, because the mean of its divisors is an integer number (31973004).

Almost surely, 2^212401405 is an apocalyptic number.

It is an amenable number.

212401405 is a deficient number, since it is larger than the sum of its proper divisors (43382627).

212401405 is a wasteful number, since it uses less digits than its factorization.

212401405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150395.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 212401405 is about 14573.9975641551. The cubic root of 212401405 is about 596.6492903331.

Adding to 212401405 its reverse (504104212), we get a palindrome (716505617).

The spelling of 212401405 in words is "two hundred twelve million, four hundred one thousand, four hundred five".