16181994 has 16 divisors (see below), whose sum is σ = 34267968. Its totient is φ = 5076672.

The previous prime is 16181981. The next prime is 16181999. The reversal of 16181994 is 49918161.

It is not an unprimeable number, because it can be changed into a prime (16181999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79222 + ... + 79425.

It is an arithmetic number, because the mean of its divisors is an integer number (2141748).

Almost surely, 2^16181994 is an apocalyptic number.

16181994 is an abundant number, since it is smaller than the sum of its proper divisors (18085974).

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

16181994 is a wasteful number, since it uses less digits than its factorization.

16181994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158669.

The product of its digits is 15552, while the sum is 39.

The square root of 16181994 is about 4022.6849242763. The cubic root of 16181994 is about 252.9360188579.

The spelling of 16181994 in words is "sixteen million, one hundred eighty-one thousand, nine hundred ninety-four".