42643912 has 8 divisors (see below), whose sum is σ = 79957350. Its totient is φ = 21321952.

The previous prime is 42643903. The next prime is 42643919. The reversal of 42643912 is 21934624.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 34035556 + 8608356 = 5834^2 + 2934^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (42643919) 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 as a sum of consecutive naturals, namely, 2665237 + ... + 2665252.

Almost surely, 2^42643912 is an apocalyptic number.

It is an amenable number.

42643912 is a deficient number, since it is larger than the sum of its proper divisors (37313438).

42643912 is a wasteful number, since it uses less digits than its factorization.

42643912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330495 (or 5330491 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 42643912 is about 6530.2306237988. The cubic root of 42643912 is about 349.3700559974.

The spelling of 42643912 in words is "forty-two million, six hundred forty-three thousand, nine hundred twelve".