42660387 has 24 divisors (see below), whose sum is σ = 76826880. Its totient is φ = 22160880.

The previous prime is 42660323. The next prime is 42660407. The reversal of 42660387 is 78306624.

42660387 is a `hidden beast` number, since 42 + 6 + 603 + 8 + 7 = 666.

It is not a de Polignac number, because 42660387 - 2⁶ = 42660323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42660887) 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, 30087 + ... + 31472.

It is an arithmetic number, because the mean of its divisors is an integer number (3201120).

Almost surely, 2^42660387 is an apocalyptic number.

42660387 is a deficient number, since it is larger than the sum of its proper divisors (34166493).

42660387 is a wasteful number, since it uses less digits than its factorization.

42660387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61583 (or 61580 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 42660387 is about 6531.4919428872. The cubic root of 42660387 is about 349.4150419468.

The spelling of 42660387 in words is "forty-two million, six hundred sixty thousand, three hundred eighty-seven".