2120005399 has 4 divisors (see below), whose sum is σ = 2120187664. Its totient is φ = 2119823136.

The previous prime is 2120005361. The next prime is 2120005441. The reversal of 2120005399 is 9935000212.

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 2120005399 - 2⁷ = 2120005271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120005399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120005319) 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, 72402 + ... + 97375.

It is an arithmetic number, because the mean of its divisors is an integer number (530046916).

Almost surely, 2^2120005399 is an apocalyptic number.

2120005399 is a deficient number, since it is larger than the sum of its proper divisors (182265).

2120005399 is a wasteful number, since it uses less digits than its factorization.

2120005399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182264.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 2120005399 is about 46043.5163622415. The cubic root of 2120005399 is about 1284.6327482346.

The spelling of 2120005399 in words is "two billion, one hundred twenty million, five thousand, three hundred ninety-nine".