18971902 has 8 divisors (see below), whose sum is σ = 28478016. Its totient is φ = 9479232.

The previous prime is 18971893. The next prime is 18971903. The reversal of 18971902 is 20917981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18971903) 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, 1683 + ... + 6385.

It is an arithmetic number, because the mean of its divisors is an integer number (3559752).

Almost surely, 2^18971902 is an apocalyptic number.

18971902 is a deficient number, since it is larger than the sum of its proper divisors (9506114).

18971902 is a wasteful number, since it uses less digits than its factorization.

18971902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6722.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 18971902 is about 4355.6746894138. The cubic root of 18971902 is about 266.7085618204.

The spelling of 18971902 in words is "eighteen million, nine hundred seventy-one thousand, nine hundred two".