42723890 has 96 divisors (see below), whose sum is σ = 93768192. Its totient is φ = 13939200.

The previous prime is 42723887. The next prime is 42723917. The reversal of 42723890 is 9832724.

42723890 = 170² + 171² + ... + 510².

42723890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42723890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 637637 + ... + 637703.

It is an arithmetic number, because the mean of its divisors is an integer number (976752).

Almost surely, 2^42723890 is an apocalyptic number.

42723890 is an abundant number, since it is smaller than the sum of its proper divisors (51044302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42723890 is a wasteful number, since it uses less digits than its factorization.

42723890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 42723890 is about 6536.3514287407. The cubic root of 42723890 is about 349.5883323156.

The spelling of 42723890 in words is "forty-two million, seven hundred twenty-three thousand, eight hundred ninety".