642929407 has 2 divisors, whose sum is σ = 642929408. Its totient is φ = 642929406.

The previous prime is 642929401. The next prime is 642929411. The reversal of 642929407 is 704929246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642929407 - 2¹⁹ = 642405119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642929401) 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 as a sum of consecutive naturals, namely, 321464703 + 321464704.

It is an arithmetic number, because the mean of its divisors is an integer number (321464704).

Almost surely, 2^642929407 is an apocalyptic number.

642929407 is a deficient number, since it is larger than the sum of its proper divisors (1).

642929407 is an equidigital number, since it uses as much as digits as its factorization.

642929407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 642929407 is about 25356.0526699248. The cubic root of 642929407 is about 863.0867116886.

The spelling of 642929407 in words is "six hundred forty-two million, nine hundred twenty-nine thousand, four hundred seven".