642121246 has 24 divisors (see below), whose sum is σ = 1104333264. Its totient is φ = 278928000.

The previous prime is 642121241. The next prime is 642121253.

642121246 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642121241) 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 11 ways as a sum of consecutive naturals, for example, 50130 + ... + 61621.

It is an arithmetic number, because the mean of its divisors is an integer number (46013886).

Almost surely, 2^642121246 is an apocalyptic number.

642121246 is a deficient number, since it is larger than the sum of its proper divisors (462212018).

642121246 is a wasteful number, since it uses less digits than its factorization.

642121246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111796 (or 111783 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 642121246 is about 25340.1114046486. Note that the first 3 decimals coincide. The cubic root of 642121246 is about 862.7249272925.

The spelling of 642121246 in words is "six hundred forty-two million, one hundred twenty-one thousand, two hundred forty-six".