405121247 has 4 divisors (see below), whose sum is σ = 413740896. Its totient is φ = 396501600.

The previous prime is 405121229. The next prime is 405121267. The reversal of 405121247 is 742121504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405121247 - 2⁶ = 405121183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405121217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4309754 + ... + 4309847.

It is an arithmetic number, because the mean of its divisors is an integer number (103435224).

Almost surely, 2^405121247 is an apocalyptic number.

405121247 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

405121247 is a deficient number, since it is larger than the sum of its proper divisors (8619649).

405121247 is an equidigital number, since it uses as much as digits as its factorization.

405121247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8619648.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 405121247 is about 20127.6239780059. The cubic root of 405121247 is about 739.9374472326.

The spelling of 405121247 in words is "four hundred five million, one hundred twenty-one thousand, two hundred forty-seven".