1047747985 has 4 divisors (see below), whose sum is σ = 1257297588. Its totient is φ = 838198384.

The previous prime is 1047747973. The next prime is 1047747997. The reversal of 1047747985 is 5897477401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5897477401 = 223 ⋅26446087.

It is an interprime number because it is at equal distance from previous prime (1047747973) and next prime (1047747997).

It can be written as a sum of positive squares in 2 ways, for example, as 554508304 + 493239681 = 23548^2 + 22209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1047747985 - 2⁹ = 1047747473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104774794 + ... + 104774803.

It is an arithmetic number, because the mean of its divisors is an integer number (314324397).

Almost surely, 2^1047747985 is an apocalyptic number.

It is an amenable number.

1047747985 is a deficient number, since it is larger than the sum of its proper divisors (209549603).

1047747985 is an equidigital number, since it uses as much as digits as its factorization.

1047747985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209549602.

The product of its (nonzero) digits is 1975680, while the sum is 52.

The square root of 1047747985 is about 32368.9354937724. The cubic root of 1047747985 is about 1015.6691891274.

It can be divided in two parts, 104 and 7747985, that multiplied together give a triangular number (805790440 = T₄₀₁₄₄).

The spelling of 1047747985 in words is "one billion, forty-seven million, seven hundred forty-seven thousand, nine hundred eighty-five".