642465401 has 4 divisors (see below), whose sum is σ = 650206032. Its totient is φ = 634724772.

The previous prime is 642465379. The next prime is 642465403. The reversal of 642465401 is 104564246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642465401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642465403) 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, 3870191 + ... + 3870356.

It is an arithmetic number, because the mean of its divisors is an integer number (162551508).

Almost surely, 2^642465401 is an apocalyptic number.

It is an amenable number.

642465401 is a deficient number, since it is larger than the sum of its proper divisors (7740631).

642465401 is an equidigital number, since it uses as much as digits as its factorization.

642465401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7740630.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 642465401 is about 25346.9012109962. The cubic root of 642465401 is about 862.8790301042.

The spelling of 642465401 in words is "six hundred forty-two million, four hundred sixty-five thousand, four hundred one".