1640312445 has 8 divisors (see below), whose sum is σ = 2624499936. Its totient is φ = 874833296.

The previous prime is 1640312437. The next prime is 1640312449. The reversal of 1640312445 is 5442130461.

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 1640312445 - 2³ = 1640312437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640312449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54677067 + ... + 54677096.

It is an arithmetic number, because the mean of its divisors is an integer number (328062492).

Almost surely, 2^1640312445 is an apocalyptic number.

1640312445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640312445 is a deficient number, since it is larger than the sum of its proper divisors (984187491).

1640312445 is a wasteful number, since it uses less digits than its factorization.

1640312445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109354171.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1640312445 is about 40500.7709185887. The cubic root of 1640312445 is about 1179.3485931114.

The spelling of 1640312445 in words is "one billion, six hundred forty million, three hundred twelve thousand, four hundred forty-five".