1390784785 has 16 divisors (see below), whose sum is σ = 1800049104. Its totient is φ = 1025482752.

The previous prime is 1390784783. The next prime is 1390784789. The reversal of 1390784785 is 5874870931.

It can be written as a sum of positive squares in 8 ways, for example, as 71351809 + 1319432976 = 8447^2 + 36324^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390784785 - 2¹ = 1390784783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390784783) 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, 27849 + ... + 59641.

It is an arithmetic number, because the mean of its divisors is an integer number (112503069).

Almost surely, 2^1390784785 is an apocalyptic number.

It is an amenable number.

1390784785 is a deficient number, since it is larger than the sum of its proper divisors (409264319).

1390784785 is a wasteful number, since it uses less digits than its factorization.

1390784785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32484.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The square root of 1390784785 is about 37293.2270660505. The cubic root of 1390784785 is about 1116.2290227784.

The spelling of 1390784785 in words is "one billion, three hundred ninety million, seven hundred eighty-four thousand, seven hundred eighty-five".