42123591 has 8 divisors (see below), whose sum is σ = 62405360. Its totient is φ = 28082376.

The previous prime is 42123583. The next prime is 42123593. The reversal of 42123591 is 19532124.

42123591 is a `hidden beast` number, since 421 + 235 + 9 + 1 = 666.

It is not a de Polignac number, because 42123591 - 2³ = 42123583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1560133 = 42123591 / (4 + 2 + 1 + 2 + 3 + 5 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42123593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780040 + ... + 780093.

It is an arithmetic number, because the mean of its divisors is an integer number (7800670).

Almost surely, 2^42123591 is an apocalyptic number.

42123591 is a deficient number, since it is larger than the sum of its proper divisors (20281769).

42123591 is a wasteful number, since it uses less digits than its factorization.

42123591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560142 (or 1560136 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 42123591 is about 6490.2689466616. The cubic root of 42123591 is about 347.9432874288.

The spelling of 42123591 in words is "forty-two million, one hundred twenty-three thousand, five hundred ninety-one".