18291434 has 16 divisors (see below), whose sum is σ = 31416000. Its totient is φ = 7824384.

The previous prime is 18291419. The next prime is 18291437. The reversal of 18291434 is 43419281.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18291434.

It is not an unprimeable number, because it can be changed into a prime (18291437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9917 + ... + 11615.

It is an arithmetic number, because the mean of its divisors is an integer number (1963500).

Almost surely, 2^18291434 is an apocalyptic number.

18291434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18291434 is a deficient number, since it is larger than the sum of its proper divisors (13124566).

18291434 is a wasteful number, since it uses less digits than its factorization.

18291434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477.

The product of its digits is 6912, while the sum is 32.

The square root of 18291434 is about 4276.8486061585. The cubic root of 18291434 is about 263.4809686838.

The spelling of 18291434 in words is "eighteen million, two hundred ninety-one thousand, four hundred thirty-four".