143385981 has 16 divisors (see below), whose sum is σ = 193752000. Its totient is φ = 94314368.

The previous prime is 143385967. The next prime is 143386013. The reversal of 143385981 is 189583341.

It is a cyclic number.

It is not a de Polignac number, because 143385981 - 2⁶ = 143385917 is a prime.

It is a super-2 number, since 2×143385981² = 41119079094664722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143385901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72595 + ... + 74543.

It is an arithmetic number, because the mean of its divisors is an integer number (12109500).

Almost surely, 2^143385981 is an apocalyptic number.

It is an amenable number.

143385981 is a deficient number, since it is larger than the sum of its proper divisors (50366019).

143385981 is a wasteful number, since it uses less digits than its factorization.

143385981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268.

The product of its digits is 103680, while the sum is 42.

The square root of 143385981 is about 11974.3885438882. The cubic root of 143385981 is about 523.4022243773.

The spelling of 143385981 in words is "one hundred forty-three million, three hundred eighty-five thousand, nine hundred eighty-one".