404961987 has 4 divisors (see below), whose sum is σ = 539949320. Its totient is φ = 269974656.

The previous prime is 404961971. The next prime is 404962001. The reversal of 404961987 is 789169404.

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

It is not a de Polignac number, because 404961987 - 2⁴ = 404961971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404961967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67493662 + ... + 67493667.

It is an arithmetic number, because the mean of its divisors is an integer number (134987330).

Almost surely, 2^404961987 is an apocalyptic number.

404961987 is a deficient number, since it is larger than the sum of its proper divisors (134987333).

404961987 is a wasteful number, since it uses less digits than its factorization.

404961987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134987332.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 404961987 is about 20123.6673347578. The cubic root of 404961987 is about 739.8404738910.

The spelling of 404961987 in words is "four hundred four million, nine hundred sixty-one thousand, nine hundred eighty-seven".