1439689557 has 16 divisors (see below), whose sum is σ = 2037249792. Its totient is φ = 901224960.

The previous prime is 1439689453. The next prime is 1439689619. The reversal of 1439689557 is 7559869341.

It is not a de Polignac number, because 1439689557 - 2¹⁴ = 1439673173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1439689497 and 1439689506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1439682557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10768 + ... + 54729.

It is an arithmetic number, because the mean of its divisors is an integer number (127328112).

Almost surely, 2^1439689557 is an apocalyptic number.

1439689557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1439689557 is a deficient number, since it is larger than the sum of its proper divisors (597560235).

1439689557 is a wasteful number, since it uses less digits than its factorization.

1439689557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65948.

The product of its digits is 8164800, while the sum is 57.

The square root of 1439689557 is about 37943.2412558548. The cubic root of 1439689557 is about 1129.1620793672.

The spelling of 1439689557 in words is "one billion, four hundred thirty-nine million, six hundred eighty-nine thousand, five hundred fifty-seven".