42891434 has 4 divisors (see below), whose sum is σ = 64337154. Its totient is φ = 21445716.

The previous prime is 42891427. The next prime is 42891461. The reversal of 42891434 is 43419824.

42891434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 36566209 + 6325225 = 6047^2 + 2515^2 .

It is a super-2 number, since 2×42891434² = 3679350221152712, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42891394 and 42891403.

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 as a sum of consecutive naturals, namely, 10722857 + ... + 10722860.

Almost surely, 2^42891434 is an apocalyptic number.

42891434 is a deficient number, since it is larger than the sum of its proper divisors (21445720).

42891434 is a wasteful number, since it uses less digits than its factorization.

42891434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21445719.

The product of its digits is 27648, while the sum is 35.

The square root of 42891434 is about 6549.1552126973. The cubic root of 42891434 is about 350.0447126550.

The spelling of 42891434 in words is "forty-two million, eight hundred ninety-one thousand, four hundred thirty-four".