19702138 has 16 divisors (see below), whose sum is σ = 30048480. Its totient is φ = 9687600.

The previous prime is 19702129. The next prime is 19702139. The reversal of 19702138 is 83120791.

It is not an unprimeable number, because it can be changed into a prime (19702139) 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, 36148 + ... + 36688.

It is an arithmetic number, because the mean of its divisors is an integer number (1878030).

Almost surely, 2^19702138 is an apocalyptic number.

19702138 is a deficient number, since it is larger than the sum of its proper divisors (10346342).

19702138 is a wasteful number, since it uses less digits than its factorization.

19702138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 19702138 is about 4438.7090465585. The cubic root of 19702138 is about 270.0874796555.

The spelling of 19702138 in words is "nineteen million, seven hundred two thousand, one hundred thirty-eight".