404854640 has 40 divisors (see below), whose sum is σ = 943252128. Its totient is φ = 161603840.

The previous prime is 404854627. The next prime is 404854649. The reversal of 404854640 is 46458404.

It is a Cunningham number, because it is equal to 20121²-1.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 404854640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404854649) 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, 35210 + ... + 45270.

Almost surely, 2^404854640 is an apocalyptic number.

404854640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404854640 is an abundant number, since it is smaller than the sum of its proper divisors (538397488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404854640 is a wasteful number, since it uses less digits than its factorization.

404854640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10577 (or 10571 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

The square root of 404854640 is about 20120.9999751503. Note that the first 4 decimals coincide. The cubic root of 404854640 is about 739.7750960067.

The spelling of 404854640 in words is "four hundred four million, eight hundred fifty-four thousand, six hundred forty".