42651819 has 16 divisors (see below), whose sum is σ = 72215040. Its totient is φ = 24372360.

The previous prime is 42651811. The next prime is 42651823. The reversal of 42651819 is 91815624.

It is not a de Polignac number, because 42651819 - 2³ = 42651811 is a prime.

It is a super-2 number, since 2×42651819² = 3638355328017522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42651811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112647 + ... + 113024.

It is an arithmetic number, because the mean of its divisors is an integer number (4513440).

Almost surely, 2^42651819 is an apocalyptic number.

42651819 is a deficient number, since it is larger than the sum of its proper divisors (29563221).

42651819 is a wasteful number, since it uses less digits than its factorization.

42651819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225687 (or 225681 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 42651819 is about 6530.8360108029. The cubic root of 42651819 is about 349.3916479683.

It can be divided in two parts, 4265 and 1819, that added together give a square (6084 = 78²).

The spelling of 42651819 in words is "forty-two million, six hundred fifty-one thousand, eight hundred nineteen".