19900307 has 4 divisors (see below), whose sum is σ = 22743216. Its totient is φ = 17057400.

The previous prime is 19900303. The next prime is 19900367. The reversal of 19900307 is 70300991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19900307 - 2² = 19900303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19900307.

It is not an unprimeable number, because it can be changed into a prime (19900301) 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, 1421444 + ... + 1421457.

It is an arithmetic number, because the mean of its divisors is an integer number (5685804).

Almost surely, 2^19900307 is an apocalyptic number.

19900307 is a deficient number, since it is larger than the sum of its proper divisors (2842909).

19900307 is an equidigital number, since it uses as much as digits as its factorization.

19900307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842908.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 19900307 is about 4460.9760142821. The cubic root of 19900307 is about 270.9899961358.

The spelling of 19900307 in words is "nineteen million, nine hundred thousand, three hundred seven".