18382949 has 4 divisors (see below), whose sum is σ = 19797036. Its totient is φ = 16968864.

The previous prime is 18382943. The next prime is 18382951. The reversal of 18382949 is 94928381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94928381 = 1321 ⋅71861.

It can be written as a sum of positive squares in 2 ways, for example, as 8958049 + 9424900 = 2993^2 + 3070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18382949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18382943) 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, 707024 + ... + 707049.

It is an arithmetic number, because the mean of its divisors is an integer number (4949259).

Almost surely, 2^18382949 is an apocalyptic number.

It is an amenable number.

18382949 is a deficient number, since it is larger than the sum of its proper divisors (1414087).

18382949 is a wasteful number, since it uses less digits than its factorization.

18382949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414086.

The product of its digits is 124416, while the sum is 44.

The square root of 18382949 is about 4287.5341398058. The cubic root of 18382949 is about 263.9196505172.

The spelling of 18382949 in words is "eighteen million, three hundred eighty-two thousand, nine hundred forty-nine".