42789457 has 4 divisors (see below), whose sum is σ = 42804580. Its totient is φ = 42774336.

The previous prime is 42789443. The next prime is 42789469. The reversal of 42789457 is 75498724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24049216 + 18740241 = 4904^2 + 4329^2 .

It is a cyclic number.

It is not a de Polignac number, because 42789457 - 2¹⁵ = 42756689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42789757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1908 + ... + 9445.

It is an arithmetic number, because the mean of its divisors is an integer number (10701145).

Almost surely, 2^42789457 is an apocalyptic number.

It is an amenable number.

42789457 is a deficient number, since it is larger than the sum of its proper divisors (15123).

42789457 is a wasteful number, since it uses less digits than its factorization.

42789457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15122.

The product of its digits is 564480, while the sum is 46.

The square root of 42789457 is about 6541.3650716039. The cubic root of 42789457 is about 349.7670749547.

The spelling of 42789457 in words is "forty-two million, seven hundred eighty-nine thousand, four hundred fifty-seven".