42042040 has 16 divisors (see below), whose sum is σ = 94594680. Its totient is φ = 16816800.

The previous prime is 42042023. The next prime is 42042053. The reversal of 42042040 is 4024024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525486 + ... + 525565.

Almost surely, 2^42042040 is an apocalyptic number.

42042040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42042040 is an abundant number, since it is smaller than the sum of its proper divisors (52552640).

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

42042040 is a wasteful number, since it uses less digits than its factorization.

42042040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051062 (or 1051058 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 42042040 is about 6483.9833435937. The cubic root of 42042040 is about 347.7186037189.

Adding to 42042040 its reverse (4024024), we get a palindrome (46066064).

The spelling of 42042040 in words is "forty-two million, forty-two thousand, forty", and thus it is an eban number.