18161948 has 36 divisors (see below), whose sum is σ = 38926440. Its totient is φ = 7372512.

The previous prime is 18161947. The next prime is 18161951. The reversal of 18161948 is 84916181.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1286 + ... + 6162.

It is an arithmetic number, because the mean of its divisors is an integer number (1081290).

Almost surely, 2^18161948 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18161948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19463220).

18161948 is an abundant number, since it is smaller than the sum of its proper divisors (20764492).

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

18161948 is a wasteful number, since it uses less digits than its factorization.

18161948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914 (or 4905 counting only the distinct ones).

The product of its digits is 13824, while the sum is 38.

The square root of 18161948 is about 4261.6837048284. The cubic root of 18161948 is about 262.8577640299.

The spelling of 18161948 in words is "eighteen million, one hundred sixty-one thousand, nine hundred forty-eight".