321405400 has 48 divisors (see below), whose sum is σ = 791232840. Its totient is φ = 120998400.

The previous prime is 321405397. The next prime is 321405439. The reversal of 321405400 is 4504123.

321405400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×321405400² = 206602862298320000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43866 + ... + 50665.

Almost surely, 2^321405400 is an apocalyptic number.

It is an amenable number.

321405400 is an abundant number, since it is smaller than the sum of its proper divisors (469827440).

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

321405400 is a wasteful number, since it uses less digits than its factorization.

321405400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94564 (or 94555 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 321405400 is about 17927.7829081010. The cubic root of 321405400 is about 684.9902497413.

Adding to 321405400 its reverse (4504123), we get a palindrome (325909523).

The spelling of 321405400 in words is "three hundred twenty-one million, four hundred five thousand, four hundred".