18799001 has 4 divisors (see below), whose sum is σ = 20245092. Its totient is φ = 17352912.

The previous prime is 18798973. The next prime is 18799009. The reversal of 18799001 is 10099781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10099781 = 67 ⋅150743.

It can be written as a sum of positive squares in 2 ways, for example, as 4206601 + 14592400 = 2051^2 + 3820^2 .

It is a cyclic number.

It is not a de Polignac number, because 18799001 - 2¹⁸ = 18536857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18799009) 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, 723026 + ... + 723051.

It is an arithmetic number, because the mean of its divisors is an integer number (5061273).

Almost surely, 2^18799001 is an apocalyptic number.

It is an amenable number.

18799001 is a deficient number, since it is larger than the sum of its proper divisors (1446091).

18799001 is a wasteful number, since it uses less digits than its factorization.

18799001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446090.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 18799001 is about 4335.7814751207. The cubic root of 18799001 is about 265.8958691288.

The spelling of 18799001 in words is "eighteen million, seven hundred ninety-nine thousand, one".