1038780691 has 4 divisors (see below), whose sum is σ = 1118686912. Its totient is φ = 958874472.

The previous prime is 1038780683. The next prime is 1038780703. The reversal of 1038780691 is 1960878301.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1038780691 - 2³ = 1038780683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1038780091) 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, 39953091 + ... + 39953116.

It is an arithmetic number, because the mean of its divisors is an integer number (279671728).

Almost surely, 2^1038780691 is an apocalyptic number.

1038780691 is a deficient number, since it is larger than the sum of its proper divisors (79906221).

1038780691 is an equidigital number, since it uses as much as digits as its factorization.

1038780691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79906220.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1038780691 is about 32230.1208654265. The cubic root of 1038780691 is about 1012.7633020651.

The spelling of 1038780691 in words is "one billion, thirty-eight million, seven hundred eighty thousand, six hundred ninety-one".