42057434 has 4 divisors (see below), whose sum is σ = 63086154. Its totient is φ = 21028716.

The previous prime is 42057413. The next prime is 42057437. The reversal of 42057434 is 43475024.

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

It can be written as a sum of positive squares in only one way, i.e., 42055225 + 2209 = 6485^2 + 47^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42057397 and 42057406.

It is not an unprimeable number, because it can be changed into a prime (42057437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10514357 + ... + 10514360.

Almost surely, 2^42057434 is an apocalyptic number.

42057434 is a deficient number, since it is larger than the sum of its proper divisors (21028720).

42057434 is a wasteful number, since it uses less digits than its factorization.

42057434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21028719.

The product of its (nonzero) digits is 13440, while the sum is 29.

The square root of 42057434 is about 6485.1703138777. The cubic root of 42057434 is about 347.7610384422.

The spelling of 42057434 in words is "forty-two million, fifty-seven thousand, four hundred thirty-four".