405478279 has 2 divisors, whose sum is σ = 405478280. Its totient is φ = 405478278.

The previous prime is 405478273. The next prime is 405478289. The reversal of 405478279 is 972874504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405478279 - 2⁹ = 405477767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405478273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202739139 + 202739140.

It is an arithmetic number, because the mean of its divisors is an integer number (202739140).

Almost surely, 2^405478279 is an apocalyptic number.

405478279 is a deficient number, since it is larger than the sum of its proper divisors (1).

405478279 is an equidigital number, since it uses as much as digits as its factorization.

405478279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 46.

The square root of 405478279 is about 20136.4912286128. The cubic root of 405478279 is about 740.1547515411.

The spelling of 405478279 in words is "four hundred five million, four hundred seventy-eight thousand, two hundred seventy-nine".