18400084 has 6 divisors (see below), whose sum is σ = 32200154. Its totient is φ = 9200040.

The previous prime is 18400073. The next prime is 18400091. The reversal of 18400084 is 48000481.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 1507984 = 4110^2 + 1228^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2300007 + ... + 2300014.

Almost surely, 2^18400084 is an apocalyptic number.

It is an amenable number.

18400084 is a deficient number, since it is larger than the sum of its proper divisors (13800070).

18400084 is a wasteful number, since it uses less digits than its factorization.

18400084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600025 (or 4600023 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 18400084 is about 4289.5319091948. The cubic root of 18400084 is about 264.0016260996.

The spelling of 18400084 in words is "eighteen million, four hundred thousand, eighty-four".