521400393 has 12 divisors (see below), whose sum is σ = 756000960. Its totient is φ = 346277016.

The previous prime is 521400391. The next prime is 521400401. The reversal of 521400393 is 393004125.

It is not a de Polignac number, because 521400393 - 2¹ = 521400391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521400391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107773 + ... + 112506.

It is an arithmetic number, because the mean of its divisors is an integer number (63000080).

Almost surely, 2^521400393 is an apocalyptic number.

It is an amenable number.

521400393 is a deficient number, since it is larger than the sum of its proper divisors (234600567).

521400393 is a wasteful number, since it uses less digits than its factorization.

521400393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220548 (or 220545 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 521400393 is about 22834.1935044792. The cubic root of 521400393 is about 804.8663759791.

The spelling of 521400393 in words is "five hundred twenty-one million, four hundred thousand, three hundred ninety-three".