1143906989 has 8 divisors (see below), whose sum is σ = 1208561280. Its totient is φ = 1079697600.

The previous prime is 1143906937. The next prime is 1143906997. The reversal of 1143906989 is 9896093411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1143906989 - 2⁸ = 1143906733 is a prime.

It is a super-2 number, since 2×1143906989² = 2617046398966092242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143906919) 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, 105932 + ... + 116229.

It is an arithmetic number, because the mean of its divisors is an integer number (151070160).

Almost surely, 2^1143906989 is an apocalyptic number.

1143906989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1143906989 is a deficient number, since it is larger than the sum of its proper divisors (64654291).

1143906989 is a wasteful number, since it uses less digits than its factorization.

1143906989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222451.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 1143906989 is about 33821.6940586955. The cubic root of 1143906989 is about 1045.8359615023.

The spelling of 1143906989 in words is "one billion, one hundred forty-three million, nine hundred six thousand, nine hundred eighty-nine".