1902648729 has 4 divisors (see below), whose sum is σ = 2536864976. Its totient is φ = 1268432484.

The previous prime is 1902648679. The next prime is 1902648731. The reversal of 1902648729 is 9278462091.

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: 9278462091 = 3 ⋅3092820697.

It is not a de Polignac number, because 1902648729 - 2⁹ = 1902648217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1902648779) 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, 317108119 + ... + 317108124.

It is an arithmetic number, because the mean of its divisors is an integer number (634216244).

Almost surely, 2^1902648729 is an apocalyptic number.

It is an amenable number.

1902648729 is a deficient number, since it is larger than the sum of its proper divisors (634216247).

1902648729 is an equidigital number, since it uses as much as digits as its factorization.

1902648729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634216246.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 1902648729 is about 43619.3618591561. The cubic root of 1902648729 is about 1239.1376090465.

The spelling of 1902648729 in words is "one billion, nine hundred two million, six hundred forty-eight thousand, seven hundred twenty-nine".