42145520 has 40 divisors (see below), whose sum is σ = 98309184. Its totient is φ = 16803072.

The previous prime is 42145513. The next prime is 42145541. The reversal of 42145520 is 2554124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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, 31097 + ... + 32423.

Almost surely, 2^42145520 is an apocalyptic number.

42145520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42145520 is an abundant number, since it is smaller than the sum of its proper divisors (56163664).

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

42145520 is a wasteful number, since it uses less digits than its factorization.

42145520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737 (or 1731 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42145520 is about 6491.9581021445. The cubic root of 42145520 is about 348.0036552221.

Adding to 42145520 its reverse (2554124), we get a palindrome (44699644).

The spelling of 42145520 in words is "forty-two million, one hundred forty-five thousand, five hundred twenty".