1397984351 has 4 divisors (see below), whose sum is σ = 1398110400. Its totient is φ = 1397858304.

The previous prime is 1397984347. The next prime is 1397984387. The reversal of 1397984351 is 1534897931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1397984351 - 2² = 1397984347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1397984351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397984311) 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 3 ways as a sum of consecutive naturals, for example, 44591 + ... + 69168.

It is an arithmetic number, because the mean of its divisors is an integer number (349527600).

Almost surely, 2^1397984351 is an apocalyptic number.

1397984351 is a deficient number, since it is larger than the sum of its proper divisors (126049).

1397984351 is a wasteful number, since it uses less digits than its factorization.

1397984351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126048.

The product of its digits is 816480, while the sum is 50.

The square root of 1397984351 is about 37389.6289230048. The cubic root of 1397984351 is about 1118.1518070172.

The spelling of 1397984351 in words is "one billion, three hundred ninety-seven million, nine hundred eighty-four thousand, three hundred fifty-one".