42145245 has 32 divisors (see below), whose sum is σ = 75997440. Its totient is φ = 22155840.

The previous prime is 42145241. The next prime is 42145247. The reversal of 42145245 is 54254124.

42145245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42145245 - 2² = 42145241 is a prime.

It is a super-2 number, since 2×42145245² = 3552443352220050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42145241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7387 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (2374920).

Almost surely, 2^42145245 is an apocalyptic number.

42145245 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42145245 is a deficient number, since it is larger than the sum of its proper divisors (33852195).

42145245 is a wasteful number, since it uses less digits than its factorization.

42145245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4482 (or 4476 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 42145245 is about 6491.9369220595. The cubic root of 42145245 is about 348.0028983112.

Adding to 42145245 its reverse (54254124), we get a palindrome (96399369).

The spelling of 42145245 in words is "forty-two million, one hundred forty-five thousand, two hundred forty-five".