161400304 has 20 divisors (see below), whose sum is σ = 336768376. Its totient is φ = 74492352.

The previous prime is 161400301. The next prime is 161400311. The reversal of 161400304 is 403004161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161400301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387774 + ... + 388189.

Almost surely, 2^161400304 is an apocalyptic number.

It is an amenable number.

161400304 is an abundant number, since it is smaller than the sum of its proper divisors (175368072).

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

161400304 is a wasteful number, since it uses less digits than its factorization.

161400304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775984 (or 775978 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 161400304 is about 12704.3419349449. The cubic root of 161400304 is about 544.4626794701.

Adding to 161400304 its reverse (403004161), we get a palindrome (564404465).

The spelling of 161400304 in words is "one hundred sixty-one million, four hundred thousand, three hundred four".