1399891086 has 40 divisors (see below), whose sum is σ = 3421960344. Its totient is φ = 424208880.

The previous prime is 1399891081. The next prime is 1399891091. The reversal of 1399891086 is 6801989931.

It is an interprime number because it is at equal distance from previous prime (1399891081) and next prime (1399891091).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399891081) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 391005 + ... + 394568.

Almost surely, 2^1399891086 is an apocalyptic number.

1399891086 is an abundant number, since it is smaller than the sum of its proper divisors (2022069258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1399891086 is a wasteful number, since it uses less digits than its factorization.

1399891086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785598 (or 785589 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The square root of 1399891086 is about 37415.1184148868. The cubic root of 1399891086 is about 1118.6599315940.

The spelling of 1399891086 in words is "one billion, three hundred ninety-nine million, eight hundred ninety-one thousand, eighty-six".