1398497787 has 6 divisors (see below), whose sum is σ = 2020052372. Its totient is φ = 932331852.

The previous prime is 1398497747. The next prime is 1398497797. The reversal of 1398497787 is 7877948931.

1398497787 is a `hidden beast` number, since 139 + 8 + 497 + 7 + 8 + 7 = 666.

It is not a de Polignac number, because 1398497787 - 2⁸ = 1398497531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398497747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77694313 + ... + 77694330.

Almost surely, 2^1398497787 is an apocalyptic number.

1398497787 is a deficient number, since it is larger than the sum of its proper divisors (621554585).

1398497787 is a wasteful number, since it uses less digits than its factorization.

1398497787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155388649 (or 155388646 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The square root of 1398497787 is about 37396.4943143071. The cubic root of 1398497787 is about 1118.2886776772.

The spelling of 1398497787 in words is "one billion, three hundred ninety-eight million, four hundred ninety-seven thousand, seven hundred eighty-seven".