42646538 has 16 divisors (see below), whose sum is σ = 70235424. Its totient is φ = 19259760.

The previous prime is 42646537. The next prime is 42646553. The reversal of 42646538 is 83564624.

It is not an unprimeable number, because it can be changed into a prime (42646537) 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 7 ways as a sum of consecutive naturals, for example, 2720 + ... + 9627.

It is an arithmetic number, because the mean of its divisors is an integer number (4389714).

Almost surely, 2^42646538 is an apocalyptic number.

42646538 is a deficient number, since it is larger than the sum of its proper divisors (27588886).

42646538 is a wasteful number, since it uses less digits than its factorization.

42646538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12517.

The product of its digits is 138240, while the sum is 38.

The square root of 42646538 is about 6530.4316855779. The cubic root of 42646538 is about 349.3772272199.

It can be divided in two parts, 426 and 46538, that added together give a palindrome (46964).

The spelling of 42646538 in words is "forty-two million, six hundred forty-six thousand, five hundred thirty-eight".