18509742 has 32 divisors (see below), whose sum is σ = 41472000. Its totient is φ = 6119064.

The previous prime is 18509741. The next prime is 18509749. The reversal of 18509742 is 24790581.

It is a super-2 number, since 2×18509742² = 685221097813128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18509697 and 18509706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18509741) 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, 5509 + ... + 8207.

It is an arithmetic number, because the mean of its divisors is an integer number (1296000).

Almost surely, 2^18509742 is an apocalyptic number.

18509742 is an abundant number, since it is smaller than the sum of its proper divisors (22962258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18509742 is a wasteful number, since it uses less digits than its factorization.

18509742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837 (or 2831 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 18509742 is about 4302.2949689671. The cubic root of 18509742 is about 264.5250398260.

The spelling of 18509742 in words is "eighteen million, five hundred nine thousand, seven hundred forty-two".