18491070 has 64 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 4282368.

The previous prime is 18491051. The next prime is 18491071. The reversal of 18491070 is 7019481.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18491071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5236 + ... + 8024.

It is an arithmetic number, because the mean of its divisors is an integer number (790965).

Almost surely, 2^18491070 is an apocalyptic number.

18491070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18491070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25310880).

18491070 is an abundant number, since it is smaller than the sum of its proper divisors (32130690).

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

18491070 is a wasteful number, since it uses less digits than its factorization.

18491070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2829.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 18491070 is about 4300.1244168047. The cubic root of 18491070 is about 264.4360619369.

The spelling of 18491070 in words is "eighteen million, four hundred ninety-one thousand, seventy".