1642995389 has 8 divisors (see below), whose sum is σ = 1913137920. Its totient is φ = 1381710096.

The previous prime is 1642995331. The next prime is 1642995391. The reversal of 1642995389 is 9835992461.

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

It is a cyclic number.

It is not a de Polignac number, because 1642995389 - 2²⁴ = 1626218173 is a prime.

It is a super-2 number, since 2×1642995389² = 5398867696550522642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642995329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213909 + ... + 2214650.

It is an arithmetic number, because the mean of its divisors is an integer number (239142240).

Almost surely, 2^1642995389 is an apocalyptic number.

It is an amenable number.

1642995389 is a deficient number, since it is larger than the sum of its proper divisors (270142531).

1642995389 is an equidigital number, since it uses as much as digits as its factorization.

1642995389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428619.

The product of its digits is 4199040, while the sum is 56.

The square root of 1642995389 is about 40533.8795207170. The cubic root of 1642995389 is about 1179.9912354515.

The spelling of 1642995389 in words is "one billion, six hundred forty-two million, nine hundred ninety-five thousand, three hundred eighty-nine".