161341440 has 224 divisors, whose sum is σ = 561478176. Its totient is φ = 39321600.

The previous prime is 161341403. The next prime is 161341447. The reversal of 161341440 is 44143161.

It is a super-2 number, since 2×161341440² = 52062120522547200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 161341440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161341447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1597390 + ... + 1597490.

It is an arithmetic number, because the mean of its divisors is an integer number (2506599).

Almost surely, 2^161341440 is an apocalyptic number.

161341440 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 161341440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280739088).

161341440 is an abundant number, since it is smaller than the sum of its proper divisors (400136736).

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

161341440 is a wasteful number, since it uses less digits than its factorization.

161341440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 161341440 is about 12702.0250354028. The cubic root of 161341440 is about 544.3964814366.

The spelling of 161341440 in words is "one hundred sixty-one million, three hundred forty-one thousand, four hundred forty".