19117902 has 16 divisors (see below), whose sum is σ = 39554640. Its totient is φ = 6152832.

The previous prime is 19117841. The next prime is 19117907. The reversal of 19117902 is 20971191.

It is a self number, because there is not a number n which added to its sum of digits gives 19117902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19117907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54763 + ... + 55110.

It is an arithmetic number, because the mean of its divisors is an integer number (2472165).

Almost surely, 2^19117902 is an apocalyptic number.

19117902 is an abundant number, since it is smaller than the sum of its proper divisors (20436738).

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

19117902 is a wasteful number, since it uses less digits than its factorization.

19117902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109907.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 19117902 is about 4372.4023145177. The cubic root of 19117902 is about 267.3909742908.

The spelling of 19117902 in words is "nineteen million, one hundred seventeen thousand, nine hundred two".