1408138 has 4 divisors (see below), whose sum is σ = 2112210. Its totient is φ = 704068.

The previous prime is 1408123. The next prime is 1408151. The reversal of 1408138 is 8318041.

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

It can be written as a sum of positive squares in only one way, i.e., 1399489 + 8649 = 1183^2 + 93^2 .

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 as a sum of consecutive naturals, namely, 352033 + ... + 352036.

2^1408138 is an apocalyptic number.

1408138 is a deficient number, since it is larger than the sum of its proper divisors (704072).

1408138 is an equidigital number, since it uses as much as digits as its factorization.

1408138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704071.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 1408138 is about 1186.6499062487. The cubic root of 1408138 is about 112.0852348625.

Subtracting 1408138 from its reverse (8318041), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1408138 in words is "one million, four hundred eight thousand, one hundred thirty-eight".