138143450 has 12 divisors (see below), whose sum is σ = 256946910. Its totient is φ = 55257360.

The previous prime is 138143449. The next prime is 138143461. The reversal of 138143450 is 54341831.

138143450 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 134768881 + 3374569 = 11609^2 + 1837^2 .

It is a super-2 number, since 2×138143450² = 38167225555805000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1381385 + ... + 1381484.

Almost surely, 2^138143450 is an apocalyptic number.

138143450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138143450 is a deficient number, since it is larger than the sum of its proper divisors (118803460).

138143450 is a wasteful number, since it uses less digits than its factorization.

138143450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762881 (or 2762876 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 138143450 is about 11753.4441760703. Note that the first 3 decimals coincide. The cubic root of 138143450 is about 516.9439210274.

The spelling of 138143450 in words is "one hundred thirty-eight million, one hundred forty-three thousand, four hundred fifty".