3649218729 has 8 divisors (see below), whose sum is σ = 5239903872. Its totient is φ = 2245673040.

The previous prime is 3649218719. The next prime is 3649218733. The reversal of 3649218729 is 9278129463.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3649218729 - 2⁹ = 3649218217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3649218719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46784817 + ... + 46784894.

It is an arithmetic number, because the mean of its divisors is an integer number (654987984).

Almost surely, 2^3649218729 is an apocalyptic number.

3649218729 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

3649218729 is a deficient number, since it is larger than the sum of its proper divisors (1590685143).

3649218729 is a wasteful number, since it uses less digits than its factorization.

3649218729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93569727.

The product of its digits is 1306368, while the sum is 51.

The square root of 3649218729 is about 60408.7636771355. The cubic root of 3649218729 is about 1539.5718617841.

The spelling of 3649218729 in words is "three billion, six hundred forty-nine million, two hundred eighteen thousand, seven hundred twenty-nine".