161390 has 8 divisors (see below), whose sum is σ = 290520. Its totient is φ = 64552.

The previous prime is 161387. The next prime is 161407. The reversal of 161390 is 93161.

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

It is a Curzon number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8060 + ... + 8079.

It is an arithmetic number, because the mean of its divisors is an integer number (36315).

2¹⁶¹³⁹⁰ is an apocalyptic number.

161390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161390 is a deficient number, since it is larger than the sum of its proper divisors (129130).

161390 is a wasteful number, since it uses less digits than its factorization.

161390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16146.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 161390 is about 401.7337426704. The cubic root of 161390 is about 54.4451092828.

The spelling of 161390 in words is "one hundred sixty-one thousand, three hundred ninety".