1143406781 has 8 divisors (see below), whose sum is σ = 1257176064. Its totient is φ = 1031274720.

The previous prime is 1143406727. The next prime is 1143406783. The reversal of 1143406781 is 1876043411.

It is a happy number.

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 1143406781 - 2²⁶ = 1076297917 is a prime.

It is a super-2 number, since 2×1143406781² = 2614758133673563922, 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 (1143406783) 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, 407840 + ... + 410633.

It is an arithmetic number, because the mean of its divisors is an integer number (157147008).

Almost surely, 2^1143406781 is an apocalyptic number.

1143406781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1143406781 is a deficient number, since it is larger than the sum of its proper divisors (113769283).

1143406781 is a wasteful number, since it uses less digits than its factorization.

1143406781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818611.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1143406781 is about 33814.2984697302. The cubic root of 1143406781 is about 1045.6834981201.

It can be divided in two parts, 114340 and 6781, that added together give a palindrome (121121).

The spelling of 1143406781 in words is "one billion, one hundred forty-three million, four hundred six thousand, seven hundred eighty-one".