42378987 has 16 divisors (see below), whose sum is σ = 67976960. Its totient is φ = 22941792.

The previous prime is 42378983. The next prime is 42378989. The reversal of 42378987 is 78987324.

It is not a de Polignac number, because 42378987 - 2² = 42378983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42378983) 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, 52708 + ... + 53505.

It is an arithmetic number, because the mean of its divisors is an integer number (4248560).

Almost surely, 2^42378987 is an apocalyptic number.

42378987 is a deficient number, since it is larger than the sum of its proper divisors (25597973).

42378987 is a wasteful number, since it uses less digits than its factorization.

42378987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106242.

The product of its digits is 677376, while the sum is 48.

The square root of 42378987 is about 6509.9145155678. The cubic root of 42378987 is about 348.6450662578.

It can be divided in two parts, 42378 and 987, that added together give a triangular number (43365 = T₂₉₄).

The spelling of 42378987 in words is "forty-two million, three hundred seventy-eight thousand, nine hundred eighty-seven".