161198420 has 54 divisors (see below), whose sum is σ = 361766958. Its totient is φ = 60323072.

The previous prime is 161198407. The next prime is 161198423. The reversal of 161198420 is 24891161.

161198420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 53993104 + 107205316 = 7348^2 + 10354^2 .

It is a super-2 number, since 2×161198420² = 51969861220992800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161198423) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 965177 + ... + 965343.

Almost surely, 2^161198420 is an apocalyptic number.

161198420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161198420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180883479).

161198420 is an abundant number, since it is smaller than the sum of its proper divisors (200568538).

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

161198420 is a wasteful number, since it uses less digits than its factorization.

161198420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 191 counting only the distinct ones).

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

The square root of 161198420 is about 12696.3939762438. The cubic root of 161198420 is about 544.2355750546.

The spelling of 161198420 in words is "one hundred sixty-one million, one hundred ninety-eight thousand, four hundred twenty".