400479729 has 16 divisors (see below), whose sum is σ = 580981632. Its totient is φ = 243906048.

The previous prime is 400479719. The next prime is 400479733. The reversal of 400479729 is 927974004.

It is not a de Polignac number, because 400479729 - 2⁵ = 400479697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400479719) 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, 49149 + ... + 56714.

It is an arithmetic number, because the mean of its divisors is an integer number (36311352).

Almost surely, 2^400479729 is an apocalyptic number.

It is an amenable number.

400479729 is a deficient number, since it is larger than the sum of its proper divisors (180501903).

400479729 is a wasteful number, since it uses less digits than its factorization.

400479729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105976.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 400479729 is about 20011.9896312186. The cubic root of 400479729 is about 737.1007381750.

The spelling of 400479729 in words is "four hundred million, four hundred seventy-nine thousand, seven hundred twenty-nine".