19878134 has 16 divisors (see below), whose sum is σ = 31746816. Its totient is φ = 9302400.

The previous prime is 19878109. The next prime is 19878143. The reversal of 19878134 is 43187891.

It is a super-2 number, since 2×19878134² = 790280422643912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19878091 and 19878100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4964 + ... + 8024.

It is an arithmetic number, because the mean of its divisors is an integer number (1984176).

Almost surely, 2^19878134 is an apocalyptic number.

19878134 is a deficient number, since it is larger than the sum of its proper divisors (11868682).

19878134 is a wasteful number, since it uses less digits than its factorization.

19878134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271.

The product of its digits is 48384, while the sum is 41.

The square root of 19878134 is about 4458.4901031627. The cubic root of 19878134 is about 270.8893126943.

The spelling of 19878134 in words is "nineteen million, eight hundred seventy-eight thousand, one hundred thirty-four".