42391530 has 48 divisors (see below), whose sum is σ = 115015680. Its totient is φ = 10812384.

The previous prime is 42391513. The next prime is 42391537. The reversal of 42391530 is 3519324.

42391530 is a `hidden beast` number, since 42 + 3 + 91 + 530 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 42391494 and 42391503.

It is not an unprimeable number, because it can be changed into a prime (42391537) 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, 8170 + ... + 12309.

It is an arithmetic number, because the mean of its divisors is an integer number (2396160).

Almost surely, 2^42391530 is an apocalyptic number.

42391530 is an abundant number, since it is smaller than the sum of its proper divisors (72624150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42391530 is a wasteful number, since it uses less digits than its factorization.

42391530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20515 (or 20512 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 42391530 is about 6510.8778210008. The cubic root of 42391530 is about 348.6794592751.

The spelling of 42391530 in words is "forty-two million, three hundred ninety-one thousand, five hundred thirty".