396634729 has 4 divisors (see below), whose sum is σ = 396816976. Its totient is φ = 396452484.

The previous prime is 396634727. The next prime is 396634751. The reversal of 396634729 is 927436693.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 927436693 = 89 ⋅10420637.

It is a cyclic number.

It is not a de Polignac number, because 396634729 - 2¹ = 396634727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396634727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87819 + ... + 92224.

It is an arithmetic number, because the mean of its divisors is an integer number (99204244).

Almost surely, 2^396634729 is an apocalyptic number.

It is an amenable number.

396634729 is a deficient number, since it is larger than the sum of its proper divisors (182247).

396634729 is a wasteful number, since it uses less digits than its factorization.

396634729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182246.

The product of its digits is 1469664, while the sum is 49.

The square root of 396634729 is about 19915.6905228014. The cubic root of 396634729 is about 734.7341837304.

The spelling of 396634729 in words is "three hundred ninety-six million, six hundred thirty-four thousand, seven hundred twenty-nine".