18395421 has 16 divisors (see below), whose sum is σ = 26844480. Its totient is φ = 11112320.

The previous prime is 18395407. The next prime is 18395437. The reversal of 18395421 is 12459381.

It is a cyclic number.

It is not a de Polignac number, because 18395421 - 2¹¹ = 18393373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18393421) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12121 + ... + 13553.

It is an arithmetic number, because the mean of its divisors is an integer number (1677780).

Almost surely, 2^18395421 is an apocalyptic number.

18395421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18395421 is a deficient number, since it is larger than the sum of its proper divisors (8449059).

18395421 is a wasteful number, since it uses less digits than its factorization.

18395421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836.

The product of its digits is 8640, while the sum is 33.

The square root of 18395421 is about 4288.9883422551. The cubic root of 18395421 is about 263.9793228755.

It can be divided in two parts, 1839 and 5421, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 18395421 in words is "eighteen million, three hundred ninety-five thousand, four hundred twenty-one".