42387191 has 16 divisors (see below), whose sum is σ = 52988928. Its totient is φ = 32940000.

The previous prime is 42387179. The next prime is 42387197. The reversal of 42387191 is 19178324.

It is a cyclic number.

It is not a de Polignac number, because 42387191 - 2¹⁸ = 42125047 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42387197) 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, 56066 + ... + 56816.

It is an arithmetic number, because the mean of its divisors is an integer number (3311808).

Almost surely, 2^42387191 is an apocalyptic number.

42387191 is a deficient number, since it is larger than the sum of its proper divisors (10601737).

42387191 is a wasteful number, since it uses less digits than its factorization.

42387191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502.

The product of its digits is 12096, while the sum is 35.

The square root of 42387191 is about 6510.5446008763. The cubic root of 42387191 is about 348.6675624662.

The spelling of 42387191 in words is "forty-two million, three hundred eighty-seven thousand, one hundred ninety-one".