1163651440 has 40 divisors (see below), whose sum is σ = 3091989600. Its totient is φ = 398966016.

The previous prime is 1163651417. The next prime is 1163651441. The reversal of 1163651440 is 441563611.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163651441) 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, 1038415 + ... + 1039534.

It is an arithmetic number, because the mean of its divisors is an integer number (77299740).

Almost surely, 2^1163651440 is an apocalyptic number.

1163651440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1163651440 is an abundant number, since it is smaller than the sum of its proper divisors (1928338160).

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

1163651440 is a wasteful number, since it uses less digits than its factorization.

1163651440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077969 (or 2077963 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1163651440 is about 34112.3355987244. The cubic root of 1163651440 is about 1051.8189002354.

The spelling of 1163651440 in words is "one billion, one hundred sixty-three million, six hundred fifty-one thousand, four hundred forty".