161219040 has 192 divisors, whose sum is σ = 531691776. Its totient is φ = 41029632.

The previous prime is 161219017. The next prime is 161219059. The reversal of 161219040 is 40912161.

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 161219040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1506667 + ... + 1506773.

It is an arithmetic number, because the mean of its divisors is an integer number (2769228).

Almost surely, 2^161219040 is an apocalyptic number.

161219040 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 161219040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265845888).

161219040 is an abundant number, since it is smaller than the sum of its proper divisors (370472736).

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

161219040 is a wasteful number, since it uses less digits than its factorization.

161219040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 161219040 is about 12697.2059918708. The cubic root of 161219040 is about 544.2587797053.

The spelling of 161219040 in words is "one hundred sixty-one million, two hundred nineteen thousand, forty".