161207838 has 96 divisors (see below), whose sum is σ = 412439040. Its totient is φ = 44954880.

The previous prime is 161207819. The next prime is 161207857. The reversal of 161207838 is 838702161.

161207838 is a `hidden beast` number, since 1 + 612 + 0 + 7 + 8 + 38 = 666.

It is an interprime number because it is at equal distance from previous prime (161207819) and next prime (161207857).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157693 + ... + 158711.

It is an arithmetic number, because the mean of its divisors is an integer number (4296240).

Almost surely, 2^161207838 is an apocalyptic number.

161207838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161207838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206219520).

161207838 is an abundant number, since it is smaller than the sum of its proper divisors (251231202).

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

161207838 is a wasteful number, since it uses less digits than its factorization.

161207838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102 (or 1099 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 161207838 is about 12696.7648635391. The cubic root of 161207838 is about 544.2461738161.

Adding to 161207838 its reverse (838702161), we get a palindrome (999909999).

The spelling of 161207838 in words is "one hundred sixty-one million, two hundred seven thousand, eight hundred thirty-eight".