1398706078931 has 6 divisors (see below), whose sum is σ = 1627066255140. Its totient is φ = 1198890924756.

The previous prime is 1398706078843. The next prime is 1398706078943.

1398706078931 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1398706078931 - 2¹⁴ = 1398706062547 is a prime.

It is a super-2 number, since 2×1398706078931² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398706078331) 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 5 ways as a sum of consecutive naturals, for example, 14272510961 + ... + 14272511058.

It is an arithmetic number, because the mean of its divisors is an integer number (271177709190).

Almost surely, 2^{1398706078931} is an apocalyptic number.

1398706078931 is a deficient number, since it is larger than the sum of its proper divisors (228360176209).

1398706078931 is an equidigital number, since it uses as much as digits as its factorization.

1398706078931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28545022033 (or 28545022026 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 1398706078931 in words is "one trillion, three hundred ninety-eight billion, seven hundred six million, seventy-eight thousand, nine hundred thirty-one".