2100040399 has 2 divisors, whose sum is σ = 2100040400. Its totient is φ = 2100040398.

The previous prime is 2100040391. The next prime is 2100040441. The reversal of 2100040399 is 9930400012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2100040399 - 2³ = 2100040391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100040391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050020199 + 1050020200.

It is an arithmetic number, because the mean of its divisors is an integer number (1050020200).

Almost surely, 2^2100040399 is an apocalyptic number.

2100040399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100040399 is an equidigital number, since it uses as much as digits as its factorization.

2100040399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 2100040399 is about 45826.1977366659. The cubic root of 2100040399 is about 1280.5873766995.

The spelling of 2100040399 in words is "two billion, one hundred million, forty thousand, three hundred ninety-nine".