73400321 has 4 divisors (see below), whose sum is σ = 73418544. Its totient is φ = 73382100.

The previous prime is 73400311. The next prime is 73400329. The reversal of 73400321 is 12300437.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73400321 - 2²² = 69206017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73400293 and 73400302.

It is not an unprimeable number, because it can be changed into a prime (73400329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (18354636).

It is a Proth number, since it is equal to 35 ⋅ 2²¹ + 1 and 35 < 2²¹.

Almost surely, 2^73400321 is an apocalyptic number.

It is an amenable number.

73400321 is a deficient number, since it is larger than the sum of its proper divisors (18223).

73400321 is a wasteful number, since it uses less digits than its factorization.

73400321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18222.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 73400321 is about 8567.3987300697. The cubic root of 73400321 is about 418.6964896056.

Adding to 73400321 its reverse (12300437), we get a palindrome (85700758).

The spelling of 73400321 in words is "seventy-three million, four hundred thousand, three hundred twenty-one".