161398404 has 36 divisors (see below), whose sum is σ = 412027980. Its totient is φ = 53265600.

The previous prime is 161398387. The next prime is 161398421. The reversal of 161398404 is 404893161.

161398404 is a `hidden beast` number, since 161 + 3 + 98 + 404 = 666.

It is an interprime number because it is at equal distance from previous prime (161398387) and next prime (161398421).

It can be written as a sum of positive squares in 2 ways, for example, as 156200004 + 5198400 = 12498^2 + 2280^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18559 + ... + 25830.

Almost surely, 2^161398404 is an apocalyptic number.

It is an amenable number.

161398404 is an abundant number, since it is smaller than the sum of its proper divisors (250629576).

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

161398404 is a wasteful number, since it uses less digits than its factorization.

161398404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44500 (or 44495 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 161398404 is about 12704.2671571405. The cubic root of 161398404 is about 544.4605429951.

The spelling of 161398404 in words is "one hundred sixty-one million, three hundred ninety-eight thousand, four hundred four".