42115889 has 4 divisors (see below), whose sum is σ = 42532980. Its totient is φ = 41698800.

The previous prime is 42115883. The next prime is 42115933. The reversal of 42115889 is 98851124.

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 27615025 + 14500864 = 5255^2 + 3808^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42115889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42115883) 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, 208394 + ... + 208595.

It is an arithmetic number, because the mean of its divisors is an integer number (10633245).

Almost surely, 2^42115889 is an apocalyptic number.

It is an amenable number.

42115889 is a deficient number, since it is larger than the sum of its proper divisors (417091).

42115889 is a wasteful number, since it uses less digits than its factorization.

42115889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417090.

The product of its digits is 23040, while the sum is 38.

The square root of 42115889 is about 6489.6755697030. The cubic root of 42115889 is about 347.9220798151.

The spelling of 42115889 in words is "forty-two million, one hundred fifteen thousand, eight hundred eighty-nine".