404981647 has 4 divisors (see below), whose sum is σ = 462836176. Its totient is φ = 347127120.

The previous prime is 404981617. The next prime is 404981659. The reversal of 404981647 is 746189404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 404981647 - 2²⁷ = 270763919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404981617) 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, 28927254 + ... + 28927267.

It is an arithmetic number, because the mean of its divisors is an integer number (115709044).

Almost surely, 2^404981647 is an apocalyptic number.

404981647 is a deficient number, since it is larger than the sum of its proper divisors (57854529).

404981647 is an equidigital number, since it uses as much as digits as its factorization.

404981647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57854528.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 404981647 is about 20124.1558083811. The cubic root of 404981647 is about 739.8524462315.

The spelling of 404981647 in words is "four hundred four million, nine hundred eighty-one thousand, six hundred forty-seven".