18902001 has 4 divisors (see below), whose sum is σ = 25202672. Its totient is φ = 12601332.

The previous prime is 18901957. The next prime is 18902041. The reversal of 18902001 is 10020981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10020981 = 3 ⋅3340327.

It is not a de Polignac number, because 18902001 - 2¹⁷ = 18770929 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 (18902041) 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, 3150331 + ... + 3150336.

It is an arithmetic number, because the mean of its divisors is an integer number (6300668).

Almost surely, 2^18902001 is an apocalyptic number.

It is an amenable number.

18902001 is a deficient number, since it is larger than the sum of its proper divisors (6300671).

18902001 is an equidigital number, since it uses as much as digits as its factorization.

18902001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6300670.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 18902001 is about 4347.6431546299. The cubic root of 18902001 is about 266.3806006985.

Adding to 18902001 its reverse (10020981), we get a palindrome (28922982).

The spelling of 18902001 in words is "eighteen million, nine hundred two thousand, one".