405618949 has 2 divisors, whose sum is σ = 405618950. Its totient is φ = 405618948.

The previous prime is 405618947. The next prime is 405618959. The reversal of 405618949 is 949816504.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313113025 + 92505924 = 17695^2 + 9618^2 .

It is a cyclic number.

It is not a de Polignac number, because 405618949 - 2¹ = 405618947 is a prime.

Together with 405618947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 405618899 and 405618908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405618947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202809474 + 202809475.

It is an arithmetic number, because the mean of its divisors is an integer number (202809475).

Almost surely, 2^405618949 is an apocalyptic number.

It is an amenable number.

405618949 is a deficient number, since it is larger than the sum of its proper divisors (1).

405618949 is an equidigital number, since it uses as much as digits as its factorization.

405618949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 405618949 is about 20139.9838381266. The cubic root of 405618949 is about 740.2403340382.

It can be divided in two parts, 4056 and 18949, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 405618949 in words is "four hundred five million, six hundred eighteen thousand, nine hundred forty-nine".