521393998 has 4 divisors (see below), whose sum is σ = 782091000. Its totient is φ = 260696998.

The previous prime is 521393993. The next prime is 521394001. The reversal of 521393998 is 899393125.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521393993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130348498 + ... + 130348501.

It is an arithmetic number, because the mean of its divisors is an integer number (195522750).

Almost surely, 2^521393998 is an apocalyptic number.

521393998 is a deficient number, since it is larger than the sum of its proper divisors (260697002).

521393998 is a wasteful number, since it uses less digits than its factorization.

521393998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260697001.

The product of its digits is 524880, while the sum is 49.

The square root of 521393998 is about 22834.0534728287. The cubic root of 521393998 is about 804.8630853912.

The spelling of 521393998 in words is "five hundred twenty-one million, three hundred ninety-three thousand, nine hundred ninety-eight".