42155020 has 12 divisors (see below), whose sum is σ = 88525584. Its totient is φ = 16862000.

The previous prime is 42154991. The next prime is 42155027. The reversal of 42155020 is 2055124.

It is a super-2 number, since 2×42155020² = 3554091422400800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42155027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053856 + ... + 1053895.

It is an arithmetic number, because the mean of its divisors is an integer number (7377132).

Almost surely, 2^42155020 is an apocalyptic number.

It is an amenable number.

42155020 is an abundant number, since it is smaller than the sum of its proper divisors (46370564).

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

42155020 is a wasteful number, since it uses less digits than its factorization.

42155020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107760 (or 2107758 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 42155020 is about 6492.6897353870. The cubic root of 42155020 is about 348.0298010327.

It can be divided in two parts, 4 and 2155020, that added together give a square (2155024 = 1468²).

The spelling of 42155020 in words is "forty-two million, one hundred fifty-five thousand, twenty".