19400849 has 8 divisors (see below), whose sum is σ = 20954472. Its totient is φ = 17856000.

The previous prime is 19400819. The next prime is 19400851. The reversal of 19400849 is 94800491.

It can be written as a sum of positive squares in 4 ways, for example, as 102400 + 19298449 = 320^2 + 4393^2 .

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 19400849 - 2¹² = 19396753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19400819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2849 + ... + 6849.

It is an arithmetic number, because the mean of its divisors is an integer number (2619309).

Almost surely, 2^19400849 is an apocalyptic number.

It is an amenable number.

19400849 is a deficient number, since it is larger than the sum of its proper divisors (1553623).

19400849 is a wasteful number, since it uses less digits than its factorization.

19400849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4387.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 19400849 is about 4404.6394858149. The cubic root of 19400849 is about 268.7036578468.

The spelling of 19400849 in words is "nineteen million, four hundred thousand, eight hundred forty-nine".