642237415 has 16 divisors (see below), whose sum is σ = 779358528. Its totient is φ = 508041216.

The previous prime is 642237397. The next prime is 642237419. The reversal of 642237415 is 514732246.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642237415 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642237419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165022 + ... + 168868.

It is an arithmetic number, because the mean of its divisors is an integer number (48709908).

Almost surely, 2^642237415 is an apocalyptic number.

642237415 is a deficient number, since it is larger than the sum of its proper divisors (137121113).

642237415 is a wasteful number, since it uses less digits than its factorization.

642237415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4218.

The product of its digits is 40320, while the sum is 34.

The square root of 642237415 is about 25342.4034969061. The cubic root of 642237415 is about 862.7769506186.

The spelling of 642237415 in words is "six hundred forty-two million, two hundred thirty-seven thousand, four hundred fifteen".