42493778 has 8 divisors (see below), whose sum is σ = 67490172. Its totient is φ = 19997056.

The previous prime is 42493771. The next prime is 42493793. The reversal of 42493778 is 87739424.

It can be written as a sum of positive squares in 2 ways, for example, as 38278969 + 4214809 = 6187^2 + 2053^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (42493771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624875 + ... + 624942.

Almost surely, 2^42493778 is an apocalyptic number.

42493778 is a deficient number, since it is larger than the sum of its proper divisors (24996394).

42493778 is a wasteful number, since it uses less digits than its factorization.

42493778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249836.

The product of its digits is 338688, while the sum is 44.

The square root of 42493778 is about 6518.7251821196. The cubic root of 42493778 is about 348.9595714561.

The spelling of 42493778 in words is "forty-two million, four hundred ninety-three thousand, seven hundred seventy-eight".