1640243120 has 40 divisors (see below), whose sum is σ = 3817039920. Its totient is φ = 655499520.

The previous prime is 1640243069. The next prime is 1640243123. The reversal of 1640243120 is 213420461.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1640243123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84926 + ... + 102434.

It is an arithmetic number, because the mean of its divisors is an integer number (95425998).

Almost surely, 2^1640243120 is an apocalyptic number.

1640243120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640243120 is an abundant number, since it is smaller than the sum of its proper divisors (2176796800).

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

1640243120 is a wasteful number, since it uses less digits than its factorization.

1640243120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18693 (or 18687 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1640243120 is about 40499.9150616393. The cubic root of 1640243120 is about 1179.3319784936.

Adding to 1640243120 its reverse (213420461), we get a palindrome (1853663581).

The spelling of 1640243120 in words is "one billion, six hundred forty million, two hundred forty-three thousand, one hundred twenty".