642972007 has 4 divisors (see below), whose sum is σ = 643328856. Its totient is φ = 642615160.

The previous prime is 642971993. The next prime is 642972017. The reversal of 642972007 is 700279246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642972007 - 2¹¹ = 642969959 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 (642972017) 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 3 ways as a sum of consecutive naturals, for example, 175708 + ... + 179329.

It is an arithmetic number, because the mean of its divisors is an integer number (160832214).

Almost surely, 2^642972007 is an apocalyptic number.

642972007 is a deficient number, since it is larger than the sum of its proper divisors (356849).

642972007 is a wasteful number, since it uses less digits than its factorization.

642972007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356848.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 642972007 is about 25356.8926921261. The cubic root of 642972007 is about 863.1057737513.

The spelling of 642972007 in words is "six hundred forty-two million, nine hundred seventy-two thousand, seven".