406112921 has 4 divisors (see below), whose sum is σ = 406153344. Its totient is φ = 406072500.

The previous prime is 406112911. The next prime is 406112923. The reversal of 406112921 is 129211604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 406112921 - 2⁶ = 406112857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406112923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7796 + ... + 29546.

It is an arithmetic number, because the mean of its divisors is an integer number (101538336).

Almost surely, 2^406112921 is an apocalyptic number.

It is an amenable number.

406112921 is a deficient number, since it is larger than the sum of its proper divisors (40423).

406112921 is a wasteful number, since it uses less digits than its factorization.

406112921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40422.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 406112921 is about 20152.2435723668. The cubic root of 406112921 is about 740.5407059874.

The spelling of 406112921 in words is "four hundred six million, one hundred twelve thousand, nine hundred twenty-one".