1143699920 has 80 divisors (see below), whose sum is σ = 2971684800. Its totient is φ = 405734400.

The previous prime is 1143699917. The next prime is 1143699989. The reversal of 1143699920 is 299963411.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20231 + ... + 51929.

It is an arithmetic number, because the mean of its divisors is an integer number (37146060).

Almost surely, 2^1143699920 is an apocalyptic number.

1143699920 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 1143699920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1485842400).

1143699920 is an abundant number, since it is smaller than the sum of its proper divisors (1827984880).

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

1143699920 is a wasteful number, since it uses less digits than its factorization.

1143699920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31764 (or 31758 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 1143699920 is about 33818.6327340417. The cubic root of 1143699920 is about 1045.7728522701.

The spelling of 1143699920 in words is "one billion, one hundred forty-three million, six hundred ninety-nine thousand, nine hundred twenty".