406254781 has 4 divisors (see below), whose sum is σ = 406924672. Its totient is φ = 405584892.

The previous prime is 406254769. The next prime is 406254791. The reversal of 406254781 is 187452604.

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 406254781 - 2¹¹ = 406252733 is a prime.

It is a super-2 number, since 2×406254781² = 330085894170715922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 406254781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406254791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334035 + ... + 335248.

It is an arithmetic number, because the mean of its divisors is an integer number (101731168).

Almost surely, 2^406254781 is an apocalyptic number.

It is an amenable number.

406254781 is a deficient number, since it is larger than the sum of its proper divisors (669891).

406254781 is an equidigital number, since it uses as much as digits as its factorization.

406254781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669890.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 406254781 is about 20155.7629724106. The cubic root of 406254781 is about 740.6269224635.

The spelling of 406254781 in words is "four hundred six million, two hundred fifty-four thousand, seven hundred eighty-one".