1398249387 has 36 divisors (see below), whose sum is σ = 2138111040. Its totient is φ = 880406496.

The previous prime is 1398249367. The next prime is 1398249407. The reversal of 1398249387 is 7839428931.

1398249387 is a `hidden beast` number, since 1 + 398 + 249 + 3 + 8 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (1398249367) and next prime (1398249407).

It is not a de Polignac number, because 1398249387 - 2⁸ = 1398249131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1398249367) 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 35 ways as a sum of consecutive naturals, for example, 1971789 + ... + 1972497.

Almost surely, 2^1398249387 is an apocalyptic number.

1398249387 is a deficient number, since it is larger than the sum of its proper divisors (739861653).

1398249387 is a wasteful number, since it uses less digits than its factorization.

1398249387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360 (or 1338 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 1398249387 is about 37393.1729998940. The cubic root of 1398249387 is about 1118.2224639255. Note that the first 3 decimals are identical.

The spelling of 1398249387 in words is "one billion, three hundred ninety-eight million, two hundred forty-nine thousand, three hundred eighty-seven".