1965373840 has 20 divisors (see below), whose sum is σ = 4569494364. Its totient is φ = 786149504.

The previous prime is 1965373799. The next prime is 1965373841. The reversal of 1965373840 is 483735691.

It can be written as a sum of positive squares in 2 ways, for example, as 807469056 + 1157904784 = 28416^2 + 34028^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1965373841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12283507 + ... + 12283666.

Almost surely, 2^1965373840 is an apocalyptic number.

1965373840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1965373840 is an abundant number, since it is smaller than the sum of its proper divisors (2604120524).

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

1965373840 is a wasteful number, since it uses less digits than its factorization.

1965373840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24567186 (or 24567180 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 1965373840 is about 44332.5370354551. The cubic root of 1965373840 is about 1252.6076422455.

The spelling of 1965373840 in words is "one billion, nine hundred sixty-five million, three hundred seventy-three thousand, eight hundred forty".