143781918 has 16 divisors (see below), whose sum is σ = 328644480. Its totient is φ = 41080536.

The previous prime is 143781881. The next prime is 143781931. The reversal of 143781918 is 819187341.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 3423379 = 143781918 / (1 + 4 + 3 + 7 + 8 + 1 + 9 + 1 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 143781918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1711648 + ... + 1711731.

It is an arithmetic number, because the mean of its divisors is an integer number (20540280).

Almost surely, 2^143781918 is an apocalyptic number.

143781918 is an abundant number, since it is smaller than the sum of its proper divisors (184862562).

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

143781918 is a wasteful number, since it uses less digits than its factorization.

143781918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423391.

The product of its digits is 48384, while the sum is 42.

The square root of 143781918 is about 11990.9098070163. The cubic root of 143781918 is about 523.8835449110.

The spelling of 143781918 in words is "one hundred forty-three million, seven hundred eighty-one thousand, nine hundred eighteen".