2154429729 has 6 divisors (see below), whose sum is σ = 3111954066. Its totient is φ = 1436286480.

The previous prime is 2154429713. The next prime is 2154429773. The reversal of 2154429729 is 9279244512.

2154429729 is a `hidden beast` number, since 2 + 154 + 429 + 72 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2124749025 + 29680704 = 46095^2 + 5448^2 .

It is not a de Polignac number, because 2154429729 - 2⁴ = 2154429713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2154427729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119690532 + ... + 119690549.

It is an arithmetic number, because the mean of its divisors is an integer number (518659011).

Almost surely, 2^2154429729 is an apocalyptic number.

It is an amenable number.

2154429729 is a deficient number, since it is larger than the sum of its proper divisors (957524337).

2154429729 is a wasteful number, since it uses less digits than its factorization.

2154429729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239381087 (or 239381084 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 2154429729 is about 46415.8348950011. The cubic root of 2154429729 is about 1291.5486736606.

The spelling of 2154429729 in words is "two billion, one hundred fifty-four million, four hundred twenty-nine thousand, seven hundred twenty-nine".