405017993 has 4 divisors (see below), whose sum is σ = 405072000. Its totient is φ = 404963988.

The previous prime is 405017969. The next prime is 405018001. The reversal of 405017993 is 399710504.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 405017993 - 2⁶ = 405017929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405017923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13505 + ... + 31502.

It is an arithmetic number, because the mean of its divisors is an integer number (101268000).

Almost surely, 2^405017993 is an apocalyptic number.

It is an amenable number.

405017993 is a deficient number, since it is larger than the sum of its proper divisors (54007).

405017993 is an equidigital number, since it uses as much as digits as its factorization.

405017993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54006.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 405017993 is about 20125.0588322121. The cubic root of 405017993 is about 739.8745788169.

The spelling of 405017993 in words is "four hundred five million, seventeen thousand, nine hundred ninety-three".