43781923 has 2 divisors, whose sum is σ = 43781924. Its totient is φ = 43781922.

The previous prime is 43781917. The next prime is 43781981. The reversal of 43781923 is 32918734.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43781923 - 2²¹ = 41684771 is a prime.

It is not a weakly prime, because it can be changed into another prime (43781123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21890961 + 21890962.

It is an arithmetic number, because the mean of its divisors is an integer number (21890962).

Almost surely, 2^43781923 is an apocalyptic number.

43781923 is a deficient number, since it is larger than the sum of its proper divisors (1).

43781923 is an equidigital number, since it uses as much as digits as its factorization.

43781923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 43781923 is about 6616.7909895961. The cubic root of 43781923 is about 352.4506189733.

The spelling of 43781923 in words is "forty-three million, seven hundred eighty-one thousand, nine hundred twenty-three".