42009495 has 64 divisors (see below), whose sum is σ = 77856768. Its totient is φ = 19152000.

The previous prime is 42009491. The next prime is 42009509. The reversal of 42009495 is 59490024.

It is not a de Polignac number, because 42009495 - 2² = 42009491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42009491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 219850 + ... + 220040.

It is an arithmetic number, because the mean of its divisors is an integer number (1216512).

Almost surely, 2^42009495 is an apocalyptic number.

42009495 is a deficient number, since it is larger than the sum of its proper divisors (35847273).

42009495 is a wasteful number, since it uses less digits than its factorization.

42009495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 42009495 is about 6481.4732121640. The cubic root of 42009495 is about 347.6288568586.

It can be divided in two parts, 4200 and 9495, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 42009495 in words is "forty-two million, nine thousand, four hundred ninety-five".