1387499997 has 8 divisors (see below), whose sum is σ = 1992307744. Its totient is φ = 853846128.

The previous prime is 1387499957. The next prime is 1387500007. The reversal of 1387499997 is 7999947831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1387499997 - 2¹¹ = 1387497949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387499957) 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 7 ways as a sum of consecutive naturals, for example, 17788423 + ... + 17788500.

It is an arithmetic number, because the mean of its divisors is an integer number (249038468).

Almost surely, 2^1387499997 is an apocalyptic number.

It is an amenable number.

1387499997 is a deficient number, since it is larger than the sum of its proper divisors (604807747).

1387499997 is a wasteful number, since it uses less digits than its factorization.

1387499997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35576939.

The product of its digits is 30862944, while the sum is 66.

The square root of 1387499997 is about 37249.1610241090. The cubic root of 1387499997 is about 1115.3495514340.

The spelling of 1387499997 in words is "one billion, three hundred eighty-seven million, four hundred ninety-nine thousand, nine hundred ninety-seven".