161004440 has 16 divisors (see below), whose sum is σ = 362260080. Its totient is φ = 64401760.

The previous prime is 161004419. The next prime is 161004443. The reversal of 161004440 is 44400161.

It is a happy number.

161004440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161004443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012516 + ... + 2012595.

It is an arithmetic number, because the mean of its divisors is an integer number (22641255).

Almost surely, 2^161004440 is an apocalyptic number.

161004440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161004440 is an abundant number, since it is smaller than the sum of its proper divisors (201255640).

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

161004440 is a wasteful number, since it uses less digits than its factorization.

161004440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025122 (or 4025118 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 161004440 is about 12688.7524997535. The cubic root of 161004440 is about 544.0171833528.

The spelling of 161004440 in words is "one hundred sixty-one million, four thousand, four hundred forty".