18400316 has 12 divisors (see below), whose sum is σ = 35127960. Its totient is φ = 8363760.

The previous prime is 18400313. The next prime is 18400351. The reversal of 18400316 is 61300481.

It is a junction number, because it is equal to n+sod(n) for n = 18400291 and 18400300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18400313) 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, 209051 + ... + 209138.

It is an arithmetic number, because the mean of its divisors is an integer number (2927330).

Almost surely, 2^18400316 is an apocalyptic number.

It is an amenable number.

18400316 is a deficient number, since it is larger than the sum of its proper divisors (16727644).

18400316 is a wasteful number, since it uses less digits than its factorization.

18400316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418204 (or 418202 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18400316 is about 4289.5589516872. The cubic root of 18400316 is about 264.0027356619.

Adding to 18400316 its reverse (61300481), we get a palindrome (79700797).

The spelling of 18400316 in words is "eighteen million, four hundred thousand, three hundred sixteen".