642929415 has 32 divisors (see below), whose sum is σ = 1044584640. Its totient is φ = 337637376.

The previous prime is 642929411. The next prime is 642929471. The reversal of 642929415 is 514929246.

It is not a de Polignac number, because 642929415 - 2² = 642929411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642929411) 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 31 ways as a sum of consecutive naturals, for example, 281719 + ... + 283991.

It is an arithmetic number, because the mean of its divisors is an integer number (32643270).

Almost surely, 2^642929415 is an apocalyptic number.

642929415 is a deficient number, since it is larger than the sum of its proper divisors (401655225).

642929415 is a wasteful number, since it uses less digits than its factorization.

642929415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563.

The product of its digits is 155520, while the sum is 42.

The square root of 642929415 is about 25356.0528276780. The cubic root of 642929415 is about 863.0867152684.

The spelling of 642929415 in words is "six hundred forty-two million, nine hundred twenty-nine thousand, four hundred fifteen".