161824440 has 32 divisors (see below), whose sum is σ = 485473680. Its totient is φ = 43153152.

The previous prime is 161824393. The next prime is 161824447. The reversal of 161824440 is 44428161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 161824398 and 161824407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161824447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674149 + ... + 674388.

Almost surely, 2^161824440 is an apocalyptic number.

161824440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161824440 is an abundant number, since it is smaller than the sum of its proper divisors (323649240).

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

161824440 is a wasteful number, since it uses less digits than its factorization.

161824440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348551 (or 1348547 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 161824440 is about 12721.0235437248. The cubic root of 161824440 is about 544.9391846401.

The spelling of 161824440 in words is "one hundred sixty-one million, eight hundred twenty-four thousand, four hundred forty".