215129434 has 16 divisors (see below), whose sum is σ = 354912768. Its totient is φ = 97177392.

The previous prime is 215129423. The next prime is 215129437. The reversal of 215129434 is 434921512.

It is a junction number, because it is equal to n+sod(n) for n = 215129396 and 215129405.

It is not an unprimeable number, because it can be changed into a prime (215129437) 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, 86802 + ... + 89245.

It is an arithmetic number, because the mean of its divisors is an integer number (22182048).

Almost surely, 2^215129434 is an apocalyptic number.

215129434 is a deficient number, since it is larger than the sum of its proper divisors (139783334).

215129434 is a wasteful number, since it uses less digits than its factorization.

215129434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176109.

The product of its digits is 8640, while the sum is 31.

The square root of 215129434 is about 14667.2912973050. The cubic root of 215129434 is about 599.1928349984.

The spelling of 215129434 in words is "two hundred fifteen million, one hundred twenty-nine thousand, four hundred thirty-four".