1964243840 has 64 divisors (see below), whose sum is σ = 5057004960. Its totient is φ = 725256192.

The previous prime is 1964243819. The next prime is 1964243843. The reversal of 1964243840 is 483424691.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964243843) 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, 109724 + ... + 126363.

Almost surely, 2^1964243840 is an apocalyptic number.

1964243840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1964243840 is an abundant number, since it is smaller than the sum of its proper divisors (3092761120).

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

1964243840 is a wasteful number, since it uses less digits than its factorization.

1964243840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236119 (or 236107 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 1964243840 is about 44319.7906132238. The cubic root of 1964243840 is about 1252.3675322020.

The spelling of 1964243840 in words is "one billion, nine hundred sixty-four million, two hundred forty-three thousand, eight hundred forty".