406987793 has 4 divisors (see below), whose sum is σ = 407554560. Its totient is φ = 406421028.

The previous prime is 406987781. The next prime is 406987799. The reversal of 406987793 is 397789604.

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 a de Polignac number, because none of the positive numbers 2^k-406987793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406987799) 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, 282305 + ... + 283742.

It is an arithmetic number, because the mean of its divisors is an integer number (101888640).

Almost surely, 2^406987793 is an apocalyptic number.

It is an amenable number.

406987793 is a deficient number, since it is larger than the sum of its proper divisors (566767).

406987793 is an equidigital number, since it uses as much as digits as its factorization.

406987793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566766.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 406987793 is about 20173.9384603007. The cubic root of 406987793 is about 741.0720964938.

The spelling of 406987793 in words is "four hundred six million, nine hundred eighty-seven thousand, seven hundred ninety-three".