161440 has 24 divisors (see below), whose sum is σ = 381780. Its totient is φ = 64512.

The previous prime is 161411. The next prime is 161453. The reversal of 161440 is 44161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 156816 + 4624 = 396^2 + 68^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

161440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345 + ... + 664.

2¹⁶¹⁴⁴⁰ is an apocalyptic number.

161440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161440 is an abundant number, since it is smaller than the sum of its proper divisors (220340).

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

161440 is a wasteful number, since it uses less digits than its factorization.

161440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 161440 is about 401.7959681231. The cubic root of 161440 is about 54.4507312221.

The spelling of 161440 in words is "one hundred sixty-one thousand, four hundred forty".