642173132 has 12 divisors (see below), whose sum is σ = 1139631696. Its totient is φ = 316564080.

The previous prime is 642173131. The next prime is 642173167. The reversal of 642173132 is 231371246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 642173095 and 642173104.

It is not an unprimeable number, because it can be changed into a prime (642173131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1130303 + ... + 1130870.

It is an arithmetic number, because the mean of its divisors is an integer number (94969308).

Almost surely, 2^642173132 is an apocalyptic number.

It is an amenable number.

642173132 is a deficient number, since it is larger than the sum of its proper divisors (497458564).

642173132 is a wasteful number, since it uses less digits than its factorization.

642173132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261248 (or 2261246 counting only the distinct ones).

The product of its digits is 6048, while the sum is 29.

The square root of 642173132 is about 25341.1351758361. The cubic root of 642173132 is about 862.7481638906.

The spelling of 642173132 in words is "six hundred forty-two million, one hundred seventy-three thousand, one hundred thirty-two".