18771434 has 32 divisors (see below), whose sum is σ = 33172416. Its totient is φ = 7870720.

The previous prime is 18771433. The next prime is 18771443. The reversal of 18771434 is 43417781.

18771434 = T₈₁₅ + T₈₁₆ + ... + T₈₆₇.

It is a junction number, because it is equal to n+sod(n) for n = 18771394 and 18771403.

It is not an unprimeable number, because it can be changed into a prime (18771433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19349 + ... + 20295.

It is an arithmetic number, because the mean of its divisors is an integer number (1036638).

Almost surely, 2^18771434 is an apocalyptic number.

18771434 is a deficient number, since it is larger than the sum of its proper divisors (14400982).

18771434 is a wasteful number, since it uses less digits than its factorization.

18771434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030.

The product of its digits is 18816, while the sum is 35.

The square root of 18771434 is about 4332.6012971424. The cubic root of 18771434 is about 265.7658349629.

The spelling of 18771434 in words is "eighteen million, seven hundred seventy-one thousand, four hundred thirty-four".