16143440 has 40 divisors (see below), whose sum is σ = 37703688. Its totient is φ = 6428160.

The previous prime is 16143437. The next prime is 16143451. The reversal of 16143440 is 4434161.

It can be written as a sum of positive squares in 4 ways, for example, as 1336336 + 14807104 = 1156^2 + 3848^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×16143440² = 521221310067200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29570 + ... + 30110.

Almost surely, 2^16143440 is an apocalyptic number.

16143440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16143440 is an abundant number, since it is smaller than the sum of its proper divisors (21560248).

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

16143440 is a wasteful number, since it uses less digits than its factorization.

16143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 16143440 is about 4017.8899935165. The cubic root of 16143440 is about 252.7349836808.

The spelling of 16143440 in words is "sixteen million, one hundred forty-three thousand, four hundred forty".