18399741 has 8 divisors (see below), whose sum is σ = 24899424. Its totient is φ = 12083280.

The previous prime is 18399737. The next prime is 18399749. The reversal of 18399741 is 14799381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18399741 - 2² = 18399737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18399693 and 18399702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18399749) 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, 45570 + ... + 45971.

It is an arithmetic number, because the mean of its divisors is an integer number (3112428).

Almost surely, 2^18399741 is an apocalyptic number.

It is an amenable number.

18399741 is a deficient number, since it is larger than the sum of its proper divisors (6499683).

18399741 is an equidigital number, since it uses as much as digits as its factorization.

18399741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91611.

The product of its digits is 54432, while the sum is 42.

The square root of 18399741 is about 4289.4919279560. The cubic root of 18399741 is about 263.9999856520. Note that the first 4 decimals are identical.

The spelling of 18399741 in words is "eighteen million, three hundred ninety-nine thousand, seven hundred forty-one".