1165209408 has 224 divisors, whose sum is σ = 3803904000. Its totient is φ = 346775040.

The previous prime is 1165209407. The next prime is 1165209421. The reversal of 1165209408 is 8049025611.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165209407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1120953 + ... + 1121991.

Almost surely, 2^1165209408 is an apocalyptic number.

1165209408 is a gapful number since it is divisible by the number (18) 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 1165209408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1901952000).

1165209408 is an abundant number, since it is smaller than the sum of its proper divisors (2638694592).

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

1165209408 is a wasteful number, since it uses less digits than its factorization.

1165209408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130 (or 1114 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1165209408 is about 34135.1638050852. The cubic root of 1165209408 is about 1052.2881041409.

The spelling of 1165209408 in words is "one billion, one hundred sixty-five million, two hundred nine thousand, four hundred eight".