19474949 has 4 divisors (see below), whose sum is σ = 20973036. Its totient is φ = 17976864.

The previous prime is 19474937. The next prime is 19474991. The reversal of 19474949 is 94947491.

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 10432900 + 9042049 = 3230^2 + 3007^2 .

It is a cyclic number.

It is not a de Polignac number, because 19474949 - 2¹⁶ = 19409413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19474909) 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, 749024 + ... + 749049.

It is an arithmetic number, because the mean of its divisors is an integer number (5243259).

Almost surely, 2^19474949 is an apocalyptic number.

It is an amenable number.

19474949 is a deficient number, since it is larger than the sum of its proper divisors (1498087).

19474949 is a wasteful number, since it uses less digits than its factorization.

19474949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498086.

The product of its digits is 326592, while the sum is 47.

The square root of 19474949 is about 4413.0430544014. The cubic root of 19474949 is about 269.0453206486.

The spelling of 19474949 in words is "nineteen million, four hundred seventy-four thousand, nine hundred forty-nine".