406161993 has 8 divisors (see below), whose sum is σ = 570052000. Its totient is φ = 256523328.

The previous prime is 406161979. The next prime is 406161997. The reversal of 406161993 is 399161604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 406161993 - 2¹⁰ = 406160969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406161997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3562768 + ... + 3562881.

It is an arithmetic number, because the mean of its divisors is an integer number (71256500).

Almost surely, 2^406161993 is an apocalyptic number.

It is an amenable number.

406161993 is a deficient number, since it is larger than the sum of its proper divisors (163890007).

406161993 is a wasteful number, since it uses less digits than its factorization.

406161993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7125671.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 406161993 is about 20153.4610675189. The cubic root of 406161993 is about 740.5705321335.

The spelling of 406161993 in words is "four hundred six million, one hundred sixty-one thousand, nine hundred ninety-three".