18971007 has 16 divisors (see below), whose sum is σ = 27762048. Its totient is φ = 11427680.

The previous prime is 18971003. The next prime is 18971009. The reversal of 18971007 is 70017981.

It is not a de Polignac number, because 18971007 - 2² = 18971003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18971003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4048 + ... + 7370.

It is an arithmetic number, because the mean of its divisors is an integer number (1735128).

Almost surely, 2^18971007 is an apocalyptic number.

18971007 is a deficient number, since it is larger than the sum of its proper divisors (8791041).

18971007 is a wasteful number, since it uses less digits than its factorization.

18971007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510.

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

The square root of 18971007 is about 4355.5719486653. The cubic root of 18971007 is about 266.7043677599.

Adding to 18971007 its reverse (70017981), we get a palindrome (88988988).

The spelling of 18971007 in words is "eighteen million, nine hundred seventy-one thousand, seven".