1642439919 has 8 divisors (see below), whose sum is σ = 2194910080. Its totient is φ = 1092464856.

The previous prime is 1642439917. The next prime is 1642439927. The reversal of 1642439919 is 9199342461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1642439919 - 2¹ = 1642439917 is a prime.

It is a super-2 number, since 2×1642439919² = 5395217775049453122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642439917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622237 + ... + 624870.

It is an arithmetic number, because the mean of its divisors is an integer number (274363760).

Almost surely, 2^1642439919 is an apocalyptic number.

1642439919 is a deficient number, since it is larger than the sum of its proper divisors (552470161).

1642439919 is a wasteful number, since it uses less digits than its factorization.

1642439919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247549.

The product of its digits is 419904, while the sum is 48.

The square root of 1642439919 is about 40527.0270190153. The cubic root of 1642439919 is about 1179.8582418523.

The spelling of 1642439919 in words is "one billion, six hundred forty-two million, four hundred thirty-nine thousand, nine hundred nineteen".