405784349 has 4 divisors (see below), whose sum is σ = 427141440. Its totient is φ = 384427260.

The previous prime is 405784277. The next prime is 405784391. The reversal of 405784349 is 943487504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405784349 - 2¹² = 405780253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405784399) 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, 10678517 + ... + 10678554.

It is an arithmetic number, because the mean of its divisors is an integer number (106785360).

Almost surely, 2^405784349 is an apocalyptic number.

It is an amenable number.

405784349 is a deficient number, since it is larger than the sum of its proper divisors (21357091).

405784349 is a wasteful number, since it uses less digits than its factorization.

405784349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21357090.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 405784349 is about 20144.0896791094. The cubic root of 405784349 is about 740.3409367618.

The spelling of 405784349 in words is "four hundred five million, seven hundred eighty-four thousand, three hundred forty-nine".