1390266787 has 16 divisors (see below), whose sum is σ = 1715116032. Its totient is φ = 1097408160.

The previous prime is 1390266751. The next prime is 1390266793. The reversal of 1390266787 is 7876620931.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1390266787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1390266787.

It is not an unprimeable number, because it can be changed into a prime (1390266187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21498 + ... + 56944.

It is an arithmetic number, because the mean of its divisors is an integer number (107194752).

Almost surely, 2^1390266787 is an apocalyptic number.

1390266787 is a deficient number, since it is larger than the sum of its proper divisors (324849245).

1390266787 is a wasteful number, since it uses less digits than its factorization.

1390266787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35898.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 1390266787 is about 37286.2814852862. The cubic root of 1390266787 is about 1116.0904256817.

The spelling of 1390266787 in words is "one billion, three hundred ninety million, two hundred sixty-six thousand, seven hundred eighty-seven".