42118040 has 32 divisors (see below), whose sum is σ = 96558480. Its totient is φ = 16528512.

The previous prime is 42118031. The next prime is 42118049. The reversal of 42118040 is 4081124.

It is an interprime number because it is at equal distance from previous prime (42118031) and next prime (42118049).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42118049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7814 + ... + 12053.

Almost surely, 2^42118040 is an apocalyptic number.

42118040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42118040 is an abundant number, since it is smaller than the sum of its proper divisors (54440440).

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

42118040 is a wasteful number, since it uses less digits than its factorization.

42118040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19931 (or 19927 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 42118040 is about 6489.8412923584. The cubic root of 42118040 is about 347.9280028975.

Adding to 42118040 its reverse (4081124), we get a palindrome (46199164).

The spelling of 42118040 in words is "forty-two million, one hundred eighteen thousand, forty".