19900007 has 4 divisors (see below), whose sum is σ = 19923576. Its totient is φ = 19876440.

The previous prime is 19899989. The next prime is 19900009. The reversal of 19900007 is 70000991.

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 19900007 - 2¹⁴ = 19883623 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 (19900009) 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, 10469 + ... + 12222.

It is an arithmetic number, because the mean of its divisors is an integer number (4980894).

Almost surely, 2^19900007 is an apocalyptic number.

19900007 is a deficient number, since it is larger than the sum of its proper divisors (23569).

19900007 is an equidigital number, since it uses as much as digits as its factorization.

19900007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23568.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 19900007 is about 4460.9423892267. The cubic root of 19900007 is about 270.9886343912.

Adding to 19900007 its reverse (70000991), we get a palindrome (89900998).

The spelling of 19900007 in words is "nineteen million, nine hundred thousand, seven".