405013649 has 4 divisors (see below), whose sum is σ = 405110964. Its totient is φ = 404916336.

The previous prime is 405013643. The next prime is 405013657. The reversal of 405013649 is 946310504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 303003649 + 102010000 = 17407^2 + 10100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405013649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (405013643) 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, 42122 + ... + 50835.

It is an arithmetic number, because the mean of its divisors is an integer number (101277741).

Almost surely, 2^405013649 is an apocalyptic number.

It is an amenable number.

405013649 is a deficient number, since it is larger than the sum of its proper divisors (97315).

405013649 is an equidigital number, since it uses as much as digits as its factorization.

405013649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97314.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 405013649 is about 20124.9509067724. The cubic root of 405013649 is about 739.8719336449.

The spelling of 405013649 in words is "four hundred five million, thirteen thousand, six hundred forty-nine".