18420349439 has 16 divisors (see below), whose sum is σ = 19881054720. Its totient is φ = 17001853440.

The previous prime is 18420349433. The next prime is 18420349459. The reversal of 18420349439 is 93494302481.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18420349439 is a prime.

It is a super-2 number, since 2×18420349439² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18420349393 and 18420349402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420349433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3052277 + ... + 3058305.

It is an arithmetic number, because the mean of its divisors is an integer number (1242565920).

Almost surely, 2^18420349439 is an apocalyptic number.

18420349439 is a deficient number, since it is larger than the sum of its proper divisors (1460705281).

18420349439 is a wasteful number, since it uses less digits than its factorization.

18420349439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9490.

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 18420349439 in words is "eighteen billion, four hundred twenty million, three hundred forty-nine thousand, four hundred thirty-nine".