161227940 has 24 divisors (see below), whose sum is σ = 342867840. Its totient is φ = 63674208.

The previous prime is 161227933. The next prime is 161227951. The reversal of 161227940 is 49722161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 161227897 and 161227906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49442 + ... + 52601.

It is an arithmetic number, because the mean of its divisors is an integer number (14286160).

Almost surely, 2^161227940 is an apocalyptic number.

161227940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161227940 is an abundant number, since it is smaller than the sum of its proper divisors (181639900).

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

161227940 is a wasteful number, since it uses less digits than its factorization.

161227940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102131 (or 102129 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 161227940 is about 12697.5564578386. The cubic root of 161227940 is about 544.2687946804.

The spelling of 161227940 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, nine hundred forty".