405780245 has 24 divisors (see below), whose sum is σ = 553477176. Its totient is φ = 283865472.

The previous prime is 405780241. The next prime is 405780247. The reversal of 405780245 is 542087504.

It can be written as a sum of positive squares in 4 ways, for example, as 10804369 + 394975876 = 3287^2 + 19874^2 .

It is not a de Polignac number, because 405780245 - 2² = 405780241 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 (405780241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14819 + ... + 32111.

It is an arithmetic number, because the mean of its divisors is an integer number (23061549).

Almost surely, 2^405780245 is an apocalyptic number.

It is an amenable number.

405780245 is a deficient number, since it is larger than the sum of its proper divisors (147696931).

405780245 is a wasteful number, since it uses less digits than its factorization.

405780245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17349 (or 17330 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 405780245 is about 20143.9878127445. The cubic root of 405780245 is about 740.3384408799.

The spelling of 405780245 in words is "four hundred five million, seven hundred eighty thousand, two hundred forty-five".