1640401446 has 16 divisors (see below), whose sum is σ = 3423446784. Its totient is φ = 523026504.

The previous prime is 1640401439. The next prime is 1640401457. The reversal of 1640401446 is 6441040461.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5943346 + ... + 5943621.

It is an arithmetic number, because the mean of its divisors is an integer number (213965424).

Almost surely, 2^1640401446 is an apocalyptic number.

1640401446 is an abundant number, since it is smaller than the sum of its proper divisors (1783045338).

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

1640401446 is a wasteful number, since it uses less digits than its factorization.

1640401446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11886995.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 1640401446 is about 40501.8696605478. The cubic root of 1640401446 is about 1179.3699226465.

The spelling of 1640401446 in words is "one billion, six hundred forty million, four hundred one thousand, four hundred forty-six".