521422000 has 160 divisors (see below), whose sum is σ = 1393464384. Its totient is φ = 187136000.

The previous prime is 521421877. The next prime is 521422037. The reversal of 521422000 is 224125.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 3013914 + ... + 3014086.

Almost surely, 2^521422000 is an apocalyptic number.

521422000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521422000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (696732192).

521422000 is an abundant number, since it is smaller than the sum of its proper divisors (872042384).

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

521422000 is a wasteful number, since it uses less digits than its factorization.

521422000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 521422000 is about 22834.6666277395. Note that the first 4 decimals coincide. The cubic root of 521422000 is about 804.8774937994.

Adding to 521422000 its reverse (224125), we get a palindrome (521646125).

The spelling of 521422000 in words is "five hundred twenty-one million, four hundred twenty-two thousand".