161838407 has 8 divisors (see below), whose sum is σ = 166394400. Its totient is φ = 157292064.

The previous prime is 161838403. The next prime is 161838431. The reversal of 161838407 is 704838161.

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

It is a cyclic number.

It is not a de Polignac number, because 161838407 - 2² = 161838403 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 (161838403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43694 + ... + 47252.

It is an arithmetic number, because the mean of its divisors is an integer number (20799300).

Almost surely, 2^161838407 is an apocalyptic number.

161838407 is a deficient number, since it is larger than the sum of its proper divisors (4555993).

161838407 is a wasteful number, since it uses less digits than its factorization.

161838407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 161838407 is about 12721.5725050011. The cubic root of 161838407 is about 544.9548620137.

The spelling of 161838407 in words is "one hundred sixty-one million, eight hundred thirty-eight thousand, four hundred seven".