42391336 has 32 divisors (see below), whose sum is σ = 90636840. Its totient is φ = 18413568.

The previous prime is 42391309. The next prime is 42391339. The reversal of 42391336 is 63319324.

It can be written as a sum of positive squares in 4 ways, for example, as 33570436 + 8820900 = 5794^2 + 2970^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42391298 and 42391307.

It is not an unprimeable number, because it can be changed into a prime (42391339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10221 + ... + 13756.

Almost surely, 2^42391336 is an apocalyptic number.

It is an amenable number.

42391336 is an abundant number, since it is smaller than the sum of its proper divisors (48245504).

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

42391336 is a wasteful number, since it uses less digits than its factorization.

42391336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24013 (or 24009 counting only the distinct ones).

The product of its digits is 11664, while the sum is 31.

The square root of 42391336 is about 6510.8629228390. The cubic root of 42391336 is about 348.6789273770.

The spelling of 42391336 in words is "forty-two million, three hundred ninety-one thousand, three hundred thirty-six".