42191284 has 12 divisors (see below), whose sum is σ = 74512900. Its totient is φ = 20901888.

The previous prime is 42191273. The next prime is 42191291. The reversal of 42191284 is 48219124.

It can be written as a sum of positive squares in 2 ways, for example, as 25200400 + 16990884 = 5020^2 + 4122^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47949 + ... + 48820.

Almost surely, 2^42191284 is an apocalyptic number.

It is an amenable number.

42191284 is a deficient number, since it is larger than the sum of its proper divisors (32321616).

42191284 is a wasteful number, since it uses less digits than its factorization.

42191284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96882 (or 96880 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 42191284 is about 6495.4818143075. The cubic root of 42191284 is about 348.1295703711.

The spelling of 42191284 in words is "forty-two million, one hundred ninety-one thousand, two hundred eighty-four".