42919973 has 2 divisors, whose sum is σ = 42919974. Its totient is φ = 42919972.

The previous prime is 42919967. The next prime is 42920021. The reversal of 42919973 is 37991924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42211009 + 708964 = 6497^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 42919973 - 2⁴ = 42919957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_2599991 and since 42919973 and 2599991 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42919073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21459986 + 21459987.

It is an arithmetic number, because the mean of its divisors is an integer number (21459987).

Almost surely, 2^42919973 is an apocalyptic number.

It is an amenable number.

42919973 is a deficient number, since it is larger than the sum of its proper divisors (1).

42919973 is an equidigital number, since it uses as much as digits as its factorization.

42919973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 42919973 is about 6551.3336810149. Note that the first 3 decimals coincide. The cubic root of 42919973 is about 350.1223327472.

It can be divided in two parts, 429 and 19973, that added together give a palindrome (20402).

The spelling of 42919973 in words is "forty-two million, nine hundred nineteen thousand, nine hundred seventy-three".