405632138 has 8 divisors (see below), whose sum is σ = 644239332. Its totient is φ = 190885696.

The previous prime is 405632131. The next prime is 405632167. The reversal of 405632138 is 831236504.

It can be written as a sum of positive squares in 2 ways, for example, as 402523969 + 3108169 = 20063^2 + 1763^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (405632131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5965145 + ... + 5965212.

Almost surely, 2^405632138 is an apocalyptic number.

405632138 is a deficient number, since it is larger than the sum of its proper divisors (238607194).

405632138 is a wasteful number, since it uses less digits than its factorization.

405632138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11930376.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 405632138 is about 20140.3112686969. The cubic root of 405632138 is about 740.2483571051.

The spelling of 405632138 in words is "four hundred five million, six hundred thirty-two thousand, one hundred thirty-eight".