19902134 has 24 divisors (see below), whose sum is σ = 34892208. Its totient is φ = 8489040.

The previous prime is 19902133. The next prime is 19902187. The reversal of 19902134 is 43120991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19902097 and 19902106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19902131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30152 + ... + 30804.

It is an arithmetic number, because the mean of its divisors is an integer number (1453842).

Almost surely, 2^19902134 is an apocalyptic number.

19902134 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19902134 is a deficient number, since it is larger than the sum of its proper divisors (14990074).

19902134 is a wasteful number, since it uses less digits than its factorization.

19902134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 19902134 is about 4461.1807853975. The cubic root of 19902134 is about 270.9982888651.

The spelling of 19902134 in words is "nineteen million, nine hundred two thousand, one hundred thirty-four".