161354440 has 48 divisors (see below), whose sum is σ = 393138900. Its totient is φ = 59574528.

The previous prime is 161354437. The next prime is 161354449. The reversal of 161354440 is 44453161.

161354440 is digitally balanced in base 3, 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 6 ways, for example, as 33709636 + 127644804 = 5806^2 + 11298^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161354399 and 161354408.

It is not an unprimeable number, because it can be changed into a prime (161354449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5175 + ... + 18694.

Almost surely, 2^161354440 is an apocalyptic number.

161354440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161354440 is an abundant number, since it is smaller than the sum of its proper divisors (231784460).

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

161354440 is a wasteful number, since it uses less digits than its factorization.

161354440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23906 (or 23889 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 161354440 is about 12702.5367545227. The cubic root of 161354440 is about 544.4111025288.

The spelling of 161354440 in words is "one hundred sixty-one million, three hundred fifty-four thousand, four hundred forty".