642444419 has 4 divisors (see below), whose sum is σ = 642524520. Its totient is φ = 642364320.

The previous prime is 642444409. The next prime is 642444421. The reversal of 642444419 is 914444246.

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 642444419 - 2¹⁶ = 642378883 is a prime.

It is a super-2 number, since 2×642444419² = 825469663008495122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642444409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26489 + ... + 44570.

It is an arithmetic number, because the mean of its divisors is an integer number (160631130).

Almost surely, 2^642444419 is an apocalyptic number.

642444419 is a deficient number, since it is larger than the sum of its proper divisors (80101).

642444419 is an equidigital number, since it uses as much as digits as its factorization.

642444419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80100.

The product of its digits is 110592, while the sum is 38.

The square root of 642444419 is about 25346.4873108681. The cubic root of 642444419 is about 862.8696365375.

The spelling of 642444419 in words is "six hundred forty-two million, four hundred forty-four thousand, four hundred nineteen".