161388330 has 16 divisors (see below), whose sum is σ = 387332064. Its totient is φ = 43036880.

The previous prime is 161388323. The next prime is 161388349. The reversal of 161388330 is 33883161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 161388291 and 161388300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2689776 + ... + 2689835.

It is an arithmetic number, because the mean of its divisors is an integer number (24208254).

Almost surely, 2^161388330 is an apocalyptic number.

161388330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161388330 is an abundant number, since it is smaller than the sum of its proper divisors (225943734).

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

161388330 is a wasteful number, since it uses less digits than its factorization.

161388330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5379621.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 161388330 is about 12703.8706699966. The cubic root of 161388330 is about 544.4492148995.

The spelling of 161388330 in words is "one hundred sixty-one million, three hundred eighty-eight thousand, three hundred thirty".