2100407 has 2 divisors, whose sum is σ = 2100408. Its totient is φ = 2100406.

The previous prime is 2100403. The next prime is 2100409. The reversal of 2100407 is 7040012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100407 - 2² = 2100403 is a prime.

Together with 2100409, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2100391 and 2100400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050203 + 1050204.

It is an arithmetic number, because the mean of its divisors is an integer number (1050204).

2^2100407 is an apocalyptic number.

2100407 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100407 is an equidigital number, since it uses as much as digits as its factorization.

2100407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 2100407 is about 1449.2780961568. The cubic root of 2100407 is about 128.0661889123.

Adding to 2100407 its reverse (7040012), we get a palindrome (9140419).

The spelling of 2100407 in words is "two million, one hundred thousand, four hundred seven".