161405826 has 8 divisors (see below), whose sum is σ = 322811664. Its totient is φ = 53801940.

The previous prime is 161405821. The next prime is 161405879. The reversal of 161405826 is 628504161.

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

161405826 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (161405821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13450480 + ... + 13450491.

It is an arithmetic number, because the mean of its divisors is an integer number (40351458).

Almost surely, 2^161405826 is an apocalyptic number.

161405826 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161405826 is a wasteful number, since it uses less digits than its factorization.

161405826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26900976.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 161405826 is about 12704.5592603600. The cubic root of 161405826 is about 544.4688886460.

Adding to 161405826 its reverse (628504161), we get a palindrome (789909987).

The spelling of 161405826 in words is "one hundred sixty-one million, four hundred five thousand, eight hundred twenty-six".