42151818 has 8 divisors (see below), whose sum is σ = 84303648. Its totient is φ = 14050604.

The previous prime is 42151787. The next prime is 42151829. The reversal of 42151818 is 81815124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

42151818 is an admirable 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, 3512646 + ... + 3512657.

It is an arithmetic number, because the mean of its divisors is an integer number (10537956).

Almost surely, 2^42151818 is an apocalyptic number.

42151818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

42151818 is a wasteful number, since it uses less digits than its factorization.

42151818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7025308.

The product of its digits is 2560, while the sum is 30.

The square root of 42151818 is about 6492.4431456887. The cubic root of 42151818 is about 348.0209889573.

The spelling of 42151818 in words is "forty-two million, one hundred fifty-one thousand, eight hundred eighteen".