16331994 has 36 divisors (see below), whose sum is σ = 41165514. Its totient is φ = 4666032.

The previous prime is 16331977. The next prime is 16331999. The reversal of 16331994 is 49913361.

16331994 is a `hidden beast` number, since 1 + 633 + 19 + 9 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15093225 + 1238769 = 3885^2 + 1113^2 .

It is not an unprimeable number, because it can be changed into a prime (16331999) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8377 + ... + 10140.

Almost surely, 2^16331994 is an apocalyptic number.

16331994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

16331994 is an abundant number, since it is smaller than the sum of its proper divisors (24833520).

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

16331994 is a wasteful number, since it uses less digits than its factorization.

16331994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18539 (or 18529 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 16331994 is about 4041.2861814031. The cubic root of 16331994 is about 253.7151517741.

The spelling of 16331994 in words is "sixteen million, three hundred thirty-one thousand, nine hundred ninety-four".