18401039 has 4 divisors (see below), whose sum is σ = 18412056. Its totient is φ = 18390024.

The previous prime is 18401029. The next prime is 18401041. The reversal of 18401039 is 93010481.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93010481 = 2243 ⋅41467.

It is a cyclic number.

It is not a de Polignac number, because 18401039 - 2⁴ = 18401023 is a prime.

It is a super-3 number, since 3×18401039³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18400999 and 18401017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18401029) 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, 2429 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (4603014).

Almost surely, 2^18401039 is an apocalyptic number.

18401039 is a deficient number, since it is larger than the sum of its proper divisors (11017).

18401039 is an equidigital number, since it uses as much as digits as its factorization.

18401039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11016.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18401039 is about 4289.6432252578. The cubic root of 18401039 is about 264.0061934191.

The spelling of 18401039 in words is "eighteen million, four hundred one thousand, thirty-nine".