400000029 has 32 divisors (see below), whose sum is σ = 629887104. Its totient is φ = 222593280.

The previous prime is 400000009. The next prime is 400000043. The reversal of 400000029 is 920000004.

It is not a de Polignac number, because 400000029 - 2¹⁷ = 399868957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399999963 and 400000017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400000009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82147 + ... + 86879.

It is an arithmetic number, because the mean of its divisors is an integer number (19683972).

Almost surely, 2^400000029 is an apocalyptic number.

It is an amenable number.

400000029 is a deficient number, since it is larger than the sum of its proper divisors (229887075).

400000029 is a wasteful number, since it uses less digits than its factorization.

400000029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4957.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 400000029 is about 20000.0007250000. Note that the first 3 decimals coincide. The cubic root of 400000029 is about 736.8063175342.

The spelling of 400000029 in words is "four hundred million, twenty-nine", and thus it is an aban number.