18401630 has 16 divisors (see below), whose sum is σ = 35671104. Its totient is φ = 6794400.

The previous prime is 18401597. The next prime is 18401639. The reversal of 18401630 is 3610481.

It is a junction number, because it is equal to n+sod(n) for n = 18401596 and 18401605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70646 + ... + 70905.

It is an arithmetic number, because the mean of its divisors is an integer number (2229444).

Almost surely, 2^18401630 is an apocalyptic number.

18401630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18401630 is a deficient number, since it is larger than the sum of its proper divisors (17269474).

18401630 is a wasteful number, since it uses less digits than its factorization.

18401630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141571.

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

The square root of 18401630 is about 4289.7121115525. The cubic root of 18401630 is about 264.0090198173.

The spelling of 18401630 in words is "eighteen million, four hundred one thousand, six hundred thirty".