405399279 has 16 divisors (see below), whose sum is σ = 558503424. Its totient is φ = 261424800.

The previous prime is 405399217. The next prime is 405399287. The reversal of 405399279 is 972993504.

It is not a de Polignac number, because 405399279 - 2⁸ = 405399023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405399179) 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 in 15 ways as a sum of consecutive naturals, for example, 6667 + ... + 29244.

It is an arithmetic number, because the mean of its divisors is an integer number (34906464).

Almost surely, 2^405399279 is an apocalyptic number.

405399279 is a deficient number, since it is larger than the sum of its proper divisors (153104145).

405399279 is a wasteful number, since it uses less digits than its factorization.

405399279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36038.

The product of its (nonzero) digits is 612360, while the sum is 48.

The square root of 405399279 is about 20134.5295202048. The cubic root of 405399279 is about 740.1066798964.

The spelling of 405399279 in words is "four hundred five million, three hundred ninety-nine thousand, two hundred seventy-nine".