1640434444 has 24 divisors (see below), whose sum is σ = 3162152448. Its totient is φ = 738410640.

The previous prime is 1640434427. The next prime is 1640434463. The reversal of 1640434444 is 4444340461.

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, 176452 + ... + 185515.

It is an arithmetic number, because the mean of its divisors is an integer number (131756352).

Almost surely, 2^1640434444 is an apocalyptic number.

It is an amenable number.

1640434444 is a deficient number, since it is larger than the sum of its proper divisors (1521718004).

1640434444 is a wasteful number, since it uses less digits than its factorization.

1640434444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362085 (or 362083 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

The square root of 1640434444 is about 40502.2770224095. The cubic root of 1640434444 is about 1179.3778305864.

The spelling of 1640434444 in words is "one billion, six hundred forty million, four hundred thirty-four thousand, four hundred forty-four".