18071970 has 64 divisors (see below), whose sum is σ = 50651136. Its totient is φ = 4040640.

The previous prime is 18071957. The next prime is 18071971. The reversal of 18071970 is 7917081.

It is not an unprimeable number, because it can be changed into a prime (18071971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8955 + ... + 10785.

It is an arithmetic number, because the mean of its divisors is an integer number (791424).

Almost surely, 2^18071970 is an apocalyptic number.

18071970 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 18071970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25325568).

18071970 is an abundant number, since it is smaller than the sum of its proper divisors (32579166).

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

18071970 is a wasteful number, since it uses less digits than its factorization.

18071970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895.

The product of its (nonzero) digits is 3528, while the sum is 33.

The square root of 18071970 is about 4251.1139716550. The cubic root of 18071970 is about 262.4229615199.

The spelling of 18071970 in words is "eighteen million, seventy-one thousand, nine hundred seventy".