1047789977 has 4 divisors (see below), whose sum is σ = 1128389220. Its totient is φ = 967190736.

The previous prime is 1047789947. The next prime is 1047789983. The reversal of 1047789977 is 7799877401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7799877401 = 691 ⋅11287811.

It can be written as a sum of positive squares in 2 ways, for example, as 518973961 + 528816016 = 22781^2 + 22996^2 .

It is a cyclic number.

It is not a de Polignac number, because 1047789977 - 2²⁰ = 1046741401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1047789907) 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, 40299602 + ... + 40299627.

It is an arithmetic number, because the mean of its divisors is an integer number (282097305).

Almost surely, 2^1047789977 is an apocalyptic number.

It is an amenable number.

1047789977 is a deficient number, since it is larger than the sum of its proper divisors (80599243).

1047789977 is an equidigital number, since it uses as much as digits as its factorization.

1047789977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80599242.

The product of its (nonzero) digits is 6223392, while the sum is 59.

The square root of 1047789977 is about 32369.5841338748. The cubic root of 1047789977 is about 1015.6827577245.

The spelling of 1047789977 in words is "one billion, forty-seven million, seven hundred eighty-nine thousand, nine hundred seventy-seven".