19990907 has 8 divisors (see below), whose sum is σ = 21162960. Its totient is φ = 18830880.

The previous prime is 19990897. The next prime is 19990931. The reversal of 19990907 is 70909991.

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 19990907 - 2⁴ = 19990891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19990937) 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, 533 + ... + 6345.

It is an arithmetic number, because the mean of its divisors is an integer number (2645370).

Almost surely, 2^19990907 is an apocalyptic number.

19990907 is a deficient number, since it is larger than the sum of its proper divisors (1172053).

19990907 is a wasteful number, since it uses less digits than its factorization.

19990907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6013.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 19990907 is about 4471.1192111148. The cubic root of 19990907 is about 271.4006184246.

The spelling of 19990907 in words is "nineteen million, nine hundred ninety thousand, nine hundred seven".