42190905 has 16 divisors (see below), whose sum is σ = 68514624. Its totient is φ = 22165440.

The previous prime is 42190903. The next prime is 42190937. The reversal of 42190905 is 50909124.

It is a happy number.

It is not a de Polignac number, because 42190905 - 2¹ = 42190903 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42190903) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 19986 + ... + 21995.

It is an arithmetic number, because the mean of its divisors is an integer number (4282164).

Almost surely, 2^42190905 is an apocalyptic number.

It is an amenable number.

42190905 is a deficient number, since it is larger than the sum of its proper divisors (26323719).

42190905 is a wasteful number, since it uses less digits than its factorization.

42190905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42056.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 42190905 is about 6495.4526401168. The cubic root of 42190905 is about 348.1285279638.

It can be divided in two parts, 42 and 190905, that multiplied together give a triangular number (8018010 = T₄₀₀₄).

The spelling of 42190905 in words is "forty-two million, one hundred ninety thousand, nine hundred five".