42047865 has 24 divisors (see below), whose sum is σ = 73536840. Its totient is φ = 22224384.

The previous prime is 42047861. The next prime is 42047867. The reversal of 42047865 is 56874024.

It can be written as a sum of positive squares in 4 ways, for example, as 2471184 + 39576681 = 1572^2 + 6291^2 .

It is not a de Polignac number, because 42047865 - 2² = 42047861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42047861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 951 + ... + 9219.

It is an arithmetic number, because the mean of its divisors is an integer number (3064035).

Almost surely, 2^42047865 is an apocalyptic number.

42047865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42047865 is a deficient number, since it is larger than the sum of its proper divisors (31488975).

42047865 is a wasteful number, since it uses less digits than its factorization.

42047865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393 (or 8390 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 42047865 is about 6484.4325117931. The cubic root of 42047865 is about 347.7346619892.

The spelling of 42047865 in words is "forty-two million, forty-seven thousand, eight hundred sixty-five".