405520074 has 64 divisors (see below), whose sum is σ = 980035200. Its totient is φ = 123773184.

The previous prime is 405520069. The next prime is 405520081. The reversal of 405520074 is 470025504.

405520074 is a `hidden beast` number, since 40 + 552 + 0 + 0 + 74 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27997 + ... + 39935.

It is an arithmetic number, because the mean of its divisors is an integer number (15313050).

Almost surely, 2^405520074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405520074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (490017600).

405520074 is an abundant number, since it is smaller than the sum of its proper divisors (574515126).

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

405520074 is a wasteful number, since it uses less digits than its factorization.

405520074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12004 (or 11998 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 405520074 is about 20137.5289943925. The cubic root of 405520074 is about 740.1801813496.

Adding to 405520074 its reverse (470025504), we get a palindrome (875545578).

The spelling of 405520074 in words is "four hundred five million, five hundred twenty thousand, seventy-four".