1642399211 has 4 divisors (see below), whose sum is σ = 1642504800. Its totient is φ = 1642293624.

The previous prime is 1642399183. The next prime is 1642399229. The reversal of 1642399211 is 1129932461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1642399211 - 2²² = 1638204907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642399261) 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, 24356 + ... + 62273.

It is an arithmetic number, because the mean of its divisors is an integer number (410626200).

Almost surely, 2^1642399211 is an apocalyptic number.

1642399211 is a deficient number, since it is larger than the sum of its proper divisors (105589).

1642399211 is an equidigital number, since it uses as much as digits as its factorization.

1642399211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105588.

The product of its digits is 23328, while the sum is 38.

The square root of 1642399211 is about 40526.5247831590. The cubic root of 1642399211 is about 1179.8484941459.

The spelling of 1642399211 in words is "one billion, six hundred forty-two million, three hundred ninety-nine thousand, two hundred eleven".