400143749 has 4 divisors (see below), whose sum is σ = 400201164. Its totient is φ = 400086336.

The previous prime is 400143677. The next prime is 400143791. The reversal of 400143749 is 947341004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169650625 + 230493124 = 13025^2 + 15182^2 .

It is a cyclic number.

It is not a de Polignac number, because 400143749 - 2²⁸ = 131708293 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 (400143349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16532 + ... + 32765.

It is an arithmetic number, because the mean of its divisors is an integer number (100050291).

Almost surely, 2^400143749 is an apocalyptic number.

It is an amenable number.

400143749 is a deficient number, since it is larger than the sum of its proper divisors (57415).

400143749 is an equidigital number, since it uses as much as digits as its factorization.

400143749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57414.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 400143749 is about 20003.5934021865. The cubic root of 400143749 is about 736.8945517978.

The spelling of 400143749 in words is "four hundred million, one hundred forty-three thousand, seven hundred forty-nine".