649646405 has 8 divisors (see below), whose sum is σ = 791211552. Its totient is φ = 511959888.

The previous prime is 649646377. The next prime is 649646419. The reversal of 649646405 is 504646946.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649646405 - 2⁶ = 649646341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 969287 + ... + 969956.

It is an arithmetic number, because the mean of its divisors is an integer number (98901444).

Almost surely, 2^649646405 is an apocalyptic number.

It is an amenable number.

649646405 is a deficient number, since it is larger than the sum of its proper divisors (141565147).

649646405 is a wasteful number, since it uses less digits than its factorization.

649646405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939315.

The product of its (nonzero) digits is 622080, while the sum is 44.

The square root of 649646405 is about 25488.1620561389. The cubic root of 649646405 is about 866.0820010463.

It can be divided in two parts, 64 and 9646405, that added together give a palindrome (9646469).

The spelling of 649646405 in words is "six hundred forty-nine million, six hundred forty-six thousand, four hundred five".