18157458 has 32 divisors (see below), whose sum is σ = 40015872. Its totient is φ = 5446800.

The previous prime is 18157441. The next prime is 18157459. The reversal of 18157458 is 85475181.

It is not an unprimeable number, because it can be changed into a prime (18157459) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5463 + ... + 8133.

It is an arithmetic number, because the mean of its divisors is an integer number (1250496).

Almost surely, 2^18157458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18157458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20007936).

18157458 is an abundant number, since it is smaller than the sum of its proper divisors (21858414).

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

18157458 is a wasteful number, since it uses less digits than its factorization.

18157458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790.

The product of its digits is 44800, while the sum is 39.

The square root of 18157458 is about 4261.1568851663. The cubic root of 18157458 is about 262.8361009970.

The spelling of 18157458 in words is "eighteen million, one hundred fifty-seven thousand, four hundred fifty-eight".