143977986 has 24 divisors (see below), whose sum is σ = 323507184. Its totient is φ = 47992500.

The previous prime is 143977969. The next prime is 143977987. The reversal of 143977986 is 689779341.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (143977987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147640 + ... + 148611.

It is an arithmetic number, because the mean of its divisors is an integer number (13479466).

Almost surely, 2^143977986 is an apocalyptic number.

143977986 is an abundant number, since it is smaller than the sum of its proper divisors (179529198).

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

143977986 is an equidigital number, since it uses as much as digits as its factorization.

143977986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296268 (or 296256 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 143977986 is about 11999.0827149412. The cubic root of 143977986 is about 524.1215677579.

The spelling of 143977986 in words is "one hundred forty-three million, nine hundred seventy-seven thousand, nine hundred eighty-six".