19900231 has 8 divisors (see below), whose sum is σ = 21474320. Its totient is φ = 18332352.

The previous prime is 19900193. The next prime is 19900253. The reversal of 19900231 is 13200991.

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

It is a cyclic number.

It is not a de Polignac number, because 19900231 - 2²³ = 11511623 is a prime.

It is a super-2 number, since 2×19900231² = 792038387706722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19900196 and 19900205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19900261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6811 + ... + 9283.

It is an arithmetic number, because the mean of its divisors is an integer number (2684290).

Almost surely, 2^19900231 is an apocalyptic number.

19900231 is a deficient number, since it is larger than the sum of its proper divisors (1574089).

19900231 is a wasteful number, since it uses less digits than its factorization.

19900231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 19900231 is about 4460.9674959587. The cubic root of 19900231 is about 270.9896511618.

The spelling of 19900231 in words is "nineteen million, nine hundred thousand, two hundred thirty-one".