649940406 has 8 divisors (see below), whose sum is σ = 1299880824. Its totient is φ = 216646800.

The previous prime is 649940377. The next prime is 649940437. The reversal of 649940406 is 604049946.

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

649940406 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54161695 + ... + 54161706.

It is an arithmetic number, because the mean of its divisors is an integer number (162485103).

Almost surely, 2^649940406 is an apocalyptic number.

649940406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649940406 is a wasteful number, since it uses less digits than its factorization.

649940406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108323406.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 649940406 is about 25493.9288066787. The cubic root of 649940406 is about 866.2126313763.

The spelling of 649940406 in words is "six hundred forty-nine million, nine hundred forty thousand, four hundred six".