161398493 has 8 divisors (see below), whose sum is σ = 176405760. Its totient is φ = 147003840.

The previous prime is 161398463. The next prime is 161398499. The reversal of 161398493 is 394893161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161398493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161398499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152603 + ... + 153656.

It is an arithmetic number, because the mean of its divisors is an integer number (22050720).

Almost surely, 2^161398493 is an apocalyptic number.

It is an amenable number.

161398493 is a deficient number, since it is larger than the sum of its proper divisors (15007267).

161398493 is a wasteful number, since it uses less digits than its factorization.

161398493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306307.

The product of its digits is 139968, while the sum is 44.

The square root of 161398493 is about 12704.2706599002. The cubic root of 161398493 is about 544.4606430724.

The spelling of 161398493 in words is "one hundred sixty-one million, three hundred ninety-eight thousand, four hundred ninety-three".