156994 has 4 divisors (see below), whose sum is σ = 235494. Its totient is φ = 78496.

The previous prime is 156979. The next prime is 157007. The reversal of 156994 is 499651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499651 = 61 ⋅8191.

It can be written as a sum of positive squares in only one way, i.e., 149769 + 7225 = 387^2 + 85^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39247 + ... + 39250.

2¹⁵⁶⁹⁹⁴ is an apocalyptic number.

156994 is a deficient number, since it is larger than the sum of its proper divisors (78500).

156994 is an equidigital number, since it uses as much as digits as its factorization.

156994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78499.

The product of its digits is 9720, while the sum is 34.

The square root of 156994 is about 396.2246837339. The cubic root of 156994 is about 53.9462198906.

The spelling of 156994 in words is "one hundred fifty-six thousand, nine hundred ninety-four".