19990949 has 8 divisors (see below), whose sum is σ = 21841248. Its totient is φ = 18146160.

The previous prime is 19990937. The next prime is 19991003. The reversal of 19990949 is 94909991.

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 19990949 - 2¹⁶ = 19925413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19990897 and 19990906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990049) 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, 11474 + ... + 13100.

It is an arithmetic number, because the mean of its divisors is an integer number (2730156).

Almost surely, 2^19990949 is an apocalyptic number.

It is an amenable number.

19990949 is a deficient number, since it is larger than the sum of its proper divisors (1850299).

19990949 is a wasteful number, since it uses less digits than its factorization.

19990949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755.

The product of its (nonzero) digits is 236196, while the sum is 50.

The square root of 19990949 is about 4471.1239079229. The cubic root of 19990949 is about 271.4008084913.

The spelling of 19990949 in words is "nineteen million, nine hundred ninety thousand, nine hundred forty-nine".