161219408 has 120 divisors (see below), whose sum is σ = 390153600. Its totient is φ = 64157184.

The previous prime is 161219407. The next prime is 161219431. The reversal of 161219408 is 804912161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161219407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1176716 + ... + 1176852.

It is an arithmetic number, because the mean of its divisors is an integer number (3251280).

Almost surely, 2^161219408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161219408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195076800).

161219408 is an abundant number, since it is smaller than the sum of its proper divisors (228934192).

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

161219408 is a wasteful number, since it uses less digits than its factorization.

161219408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 161219408 is about 12697.2204832396. The cubic root of 161219408 is about 544.2591938150.

The spelling of 161219408 in words is "one hundred sixty-one million, two hundred nineteen thousand, four hundred eight".