19770043 has 4 divisors (see below), whose sum is σ = 19965888. Its totient is φ = 19574200.

The previous prime is 19770029. The next prime is 19770061. The reversal of 19770043 is 34007791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19770043 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19769987 and 19770014.

It is not an unprimeable number, because it can be changed into a prime (19770073) 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, 97771 + ... + 97972.

It is an arithmetic number, because the mean of its divisors is an integer number (4991472).

Almost surely, 2^19770043 is an apocalyptic number.

19770043 is a deficient number, since it is larger than the sum of its proper divisors (195845).

19770043 is a wasteful number, since it uses less digits than its factorization.

19770043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195844.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 19770043 is about 4446.3516505108. The cubic root of 19770043 is about 270.3974165793.

The spelling of 19770043 in words is "nineteen million, seven hundred seventy thousand, forty-three".