38478729 has 4 divisors (see below), whose sum is σ = 51304976. Its totient is φ = 25652484.

The previous prime is 38478721. The next prime is 38478731. The reversal of 38478729 is 92787483.

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.

It is not a de Polignac number, because 38478729 - 2³ = 38478721 is a prime.

It is a super-2 number, since 2×38478729² = 2961225170910882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38478721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6413119 + ... + 6413124.

It is an arithmetic number, because the mean of its divisors is an integer number (12826244).

Almost surely, 2^38478729 is an apocalyptic number.

It is an amenable number.

38478729 is a deficient number, since it is larger than the sum of its proper divisors (12826247).

38478729 is a wasteful number, since it uses less digits than its factorization.

38478729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12826246.

The product of its digits is 677376, while the sum is 48.

The square root of 38478729 is about 6203.1225201506. The cubic root of 38478729 is about 337.6034733485.

The spelling of 38478729 in words is "thirty-eight million, four hundred seventy-eight thousand, seven hundred twenty-nine".