143649493 has 6 divisors (see below), whose sum is σ = 155549634. Its totient is φ = 132599376.

The previous prime is 143649487. The next prime is 143649521. The reversal of 143649493 is 394946341.

It can be written as a sum of positive squares in 3 ways, for example, as 7273809 + 136375684 = 2697^2 + 11678^2 .

It is not a de Polignac number, because 143649493 - 2²⁵ = 110095061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143649463) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 424830 + ... + 425167.

It is an arithmetic number, because the mean of its divisors is an integer number (25924939).

Almost surely, 2^143649493 is an apocalyptic number.

143649493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

143649493 is a deficient number, since it is larger than the sum of its proper divisors (11900141).

143649493 is an equidigital number, since it uses as much as digits as its factorization.

143649493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850023 (or 850010 counting only the distinct ones).

The product of its digits is 279936, while the sum is 43.

The square root of 143649493 is about 11985.3866437425. The cubic root of 143649493 is about 523.7226610094.

It can be divided in two parts, 143 and 649493, that added together give a square (649636 = 806²).

The spelling of 143649493 in words is "one hundred forty-three million, six hundred forty-nine thousand, four hundred ninety-three".