1161699840 has 480 divisors, whose sum is σ = 4814156160. Its totient is φ = 265531392.

The previous prime is 1161699827. The next prime is 1161699853. The reversal of 1161699840 is 489961611.

It is an interprime number because it is at equal distance from previous prime (1161699827) and next prime (1161699853).

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 (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 165957117 + ... + 165957123.

It is an arithmetic number, because the mean of its divisors is an integer number (10029492).

Almost surely, 2^1161699840 is an apocalyptic number.

1161699840 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 1161699840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2407078080).

1161699840 is an abundant number, since it is smaller than the sum of its proper divisors (3652456320).

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

1161699840 is an frugal number, since it uses more digits than its factorization.

1161699840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1161699840 is about 34083.7181070376. The cubic root of 1161699840 is about 1051.2305572736.

The spelling of 1161699840 in words is "one billion, one hundred sixty-one million, six hundred ninety-nine thousand, eight hundred forty".