143667381 has 16 divisors (see below), whose sum is σ = 225046080. Its totient is φ = 80373120.

The previous prime is 143667371. The next prime is 143667401. The reversal of 143667381 is 183766341.

It is not a de Polignac number, because 143667381 - 2⁶ = 143667317 is a prime.

It is a super-2 number, since 2×143667381² = 41280632726798322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143667371) 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, 167016 + ... + 167873.

It is an arithmetic number, because the mean of its divisors is an integer number (14065380).

Almost surely, 2^143667381 is an apocalyptic number.

143667381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

143667381 is a deficient number, since it is larger than the sum of its proper divisors (81378699).

143667381 is a wasteful number, since it uses less digits than its factorization.

143667381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334916.

The product of its digits is 72576, while the sum is 39.

The square root of 143667381 is about 11986.1328626042. The cubic root of 143667381 is about 523.7443990189.

The spelling of 143667381 in words is "one hundred forty-three million, six hundred sixty-seven thousand, three hundred eighty-one".