404978550 has 48 divisors (see below), whose sum is σ = 1010024640. Its totient is φ = 107383840.

The previous prime is 404978543. The next prime is 404978557. The reversal of 404978550 is 55879404.

It is an interprime number because it is at equal distance from previous prime (404978543) and next prime (404978557).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404978557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19309 + ... + 34391.

It is an arithmetic number, because the mean of its divisors is an integer number (21042180).

Almost surely, 2^404978550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404978550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505012320).

404978550 is an abundant number, since it is smaller than the sum of its proper divisors (605046090).

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

404978550 is a wasteful number, since it uses less digits than its factorization.

404978550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15277 (or 15272 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 404978550 is about 20124.0788609069. The cubic root of 404978550 is about 739.8505602787.

It can be divided in two parts, 40 and 4978550, that added together give a triangular number (4978590 = T₃₁₅₅).

The spelling of 404978550 in words is "four hundred four million, nine hundred seventy-eight thousand, five hundred fifty".