406253987 has 2 divisors, whose sum is σ = 406253988. Its totient is φ = 406253986.

The previous prime is 406253971. The next prime is 406253989. The reversal of 406253987 is 789352604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406253987 - 2⁴ = 406253971 is a prime.

Together with 406253989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (406253989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203126993 + 203126994.

It is an arithmetic number, because the mean of its divisors is an integer number (203126994).

Almost surely, 2^406253987 is an apocalyptic number.

406253987 is a deficient number, since it is larger than the sum of its proper divisors (1).

406253987 is an equidigital number, since it uses as much as digits as its factorization.

406253987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 406253987 is about 20155.7432758011. The cubic root of 406253987 is about 740.6264399599.

The spelling of 406253987 in words is "four hundred six million, two hundred fifty-three thousand, nine hundred eighty-seven".