521394000 has 160 divisors (see below), whose sum is σ = 1707378816. Its totient is φ = 136857600.

The previous prime is 521393993. The next prime is 521394001. The reversal of 521394000 is 493125.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521394001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 401352 + ... + 402648.

Almost surely, 2^521394000 is an apocalyptic number.

521394000 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 521394000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853689408).

521394000 is an abundant number, since it is smaller than the sum of its proper divisors (1185984816).

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

521394000 is a wasteful number, since it uses less digits than its factorization.

521394000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390 (or 1374 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 521394000 is about 22834.0535166229. The cubic root of 521394000 is about 804.8630864203.

The spelling of 521394000 in words is "five hundred twenty-one million, three hundred ninety-four thousand".