1439057691 has 32 divisors (see below), whose sum is σ = 2238451200. Its totient is φ = 912431520.

The previous prime is 1439057689. The next prime is 1439057699. The reversal of 1439057691 is 1967509341.

It is not a de Polignac number, because 1439057691 - 2¹ = 1439057689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1439057699) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38746 + ... + 66176.

It is an arithmetic number, because the mean of its divisors is an integer number (69951600).

Almost surely, 2^1439057691 is an apocalyptic number.

1439057691 is a deficient number, since it is larger than the sum of its proper divisors (799393509).

1439057691 is a wasteful number, since it uses less digits than its factorization.

1439057691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27536 (or 27530 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 1439057691 is about 37934.9138789058. The cubic root of 1439057691 is about 1128.9968623758.

The spelling of 1439057691 in words is "one billion, four hundred thirty-nine million, fifty-seven thousand, six hundred ninety-one".