405247847 has 2 divisors, whose sum is σ = 405247848. Its totient is φ = 405247846.

The previous prime is 405247823. The next prime is 405247859. The reversal of 405247847 is 748742504.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405247847 - 2²⁸ = 136812391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405247807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202623923 + 202623924.

It is an arithmetic number, because the mean of its divisors is an integer number (202623924).

Almost surely, 2^405247847 is an apocalyptic number.

405247847 is a deficient number, since it is larger than the sum of its proper divisors (1).

405247847 is an equidigital number, since it uses as much as digits as its factorization.

405247847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250880, while the sum is 41.

The square root of 405247847 is about 20130.7686639135. The cubic root of 405247847 is about 740.0145157854.

The spelling of 405247847 in words is "four hundred five million, two hundred forty-seven thousand, eight hundred forty-seven".