1397788973 has 8 divisors (see below), whose sum is σ = 1616720448. Its totient is φ = 1183669344.

The previous prime is 1397788969. The next prime is 1397788991. The reversal of 1397788973 is 3798877931.

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

It is a cyclic number.

It is not a de Polignac number, because 1397788973 - 2² = 1397788969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397778973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1202336 + ... + 1203497.

It is an arithmetic number, because the mean of its divisors is an integer number (202090056).

Almost surely, 2^1397788973 is an apocalyptic number.

It is an amenable number.

1397788973 is a deficient number, since it is larger than the sum of its proper divisors (218931475).

1397788973 is an equidigital number, since it uses as much as digits as its factorization.

1397788973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405923.

The product of its digits is 16003008, while the sum is 62.

The square root of 1397788973 is about 37387.0161018501. The cubic root of 1397788973 is about 1118.0997147693.

The spelling of 1397788973 in words is "one billion, three hundred ninety-seven million, seven hundred eighty-eight thousand, nine hundred seventy-three".