1165401600 has 480 divisors, whose sum is σ = 4384005120. Its totient is φ = 270336000.

The previous prime is 1165401593. The next prime is 1165401647. The reversal of 1165401600 is 61045611.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13094356 + ... + 13094444.

It is an arithmetic number, because the mean of its divisors is an integer number (9133344).

Almost surely, 2^1165401600 is an apocalyptic number.

1165401600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165401600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2192002560).

1165401600 is an abundant number, since it is smaller than the sum of its proper divisors (3218603520).

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

1165401600 is a wasteful number, since it uses less digits than its factorization.

1165401600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1165401600 is about 34137.9788505412. The cubic root of 1165401600 is about 1052.3459564707.

The spelling of 1165401600 in words is "one billion, one hundred sixty-five million, four hundred one thousand, six hundred".