19804949 has 4 divisors (see below), whose sum is σ = 20969964. Its totient is φ = 18639936.

The previous prime is 19804937. The next prime is 19804969. The reversal of 19804949 is 94940891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17222500 + 2582449 = 4150^2 + 1607^2 .

It is a cyclic number.

It is not a de Polignac number, because 19804949 - 2⁴ = 19804933 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 (19804969) 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, 582482 + ... + 582515.

It is an arithmetic number, because the mean of its divisors is an integer number (5242491).

Almost surely, 2^19804949 is an apocalyptic number.

It is an amenable number.

19804949 is a deficient number, since it is larger than the sum of its proper divisors (1165015).

19804949 is a wasteful number, since it uses less digits than its factorization.

19804949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165014.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 19804949 is about 4450.2751600322. The cubic root of 19804949 is about 270.5564609610.

The spelling of 19804949 in words is "nineteen million, eight hundred four thousand, nine hundred forty-nine".