18707970 has 64 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 4517568.

The previous prime is 18707957. The next prime is 18707971. The reversal of 18707970 is 7970781.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18707971) 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 31 ways as a sum of consecutive naturals, for example, 12397 + ... + 13823.

It is an arithmetic number, because the mean of its divisors is an integer number (771120).

Almost surely, 2^18707970 is an apocalyptic number.

18707970 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 18707970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24675840).

18707970 is an abundant number, since it is smaller than the sum of its proper divisors (30643710).

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

18707970 is a wasteful number, since it uses less digits than its factorization.

18707970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479.

The product of its (nonzero) digits is 24696, while the sum is 39.

The square root of 18707970 is about 4325.2710897700. The cubic root of 18707970 is about 265.4659891673.

The spelling of 18707970 in words is "eighteen million, seven hundred seven thousand, nine hundred seventy".