18135970 has 8 divisors (see below), whose sum is σ = 32644764. Its totient is φ = 7254384.

The previous prime is 18135967. The next prime is 18135979. The reversal of 18135970 is 7953181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18088009 + 47961 = 4253^2 + 219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18135979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906789 + ... + 906808.

Almost surely, 2^18135970 is an apocalyptic number.

18135970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18135970 is a deficient number, since it is larger than the sum of its proper divisors (14508794).

18135970 is a wasteful number, since it uses less digits than its factorization.

18135970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813604.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 18135970 is about 4258.6347577598. The cubic root of 18135970 is about 262.7323777495.

The spelling of 18135970 in words is "eighteen million, one hundred thirty-five thousand, nine hundred seventy".