1398668931 has 64 divisors (see below), whose sum is σ = 2458460160. Its totient is φ = 776148480.

The previous prime is 1398668923. The next prime is 1398668941.

1398668931 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1398668931 - 2³ = 1398668923 is a prime.

It is a super-2 number, since 2×1398668931² = 3912549557089365522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1398668941) 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 63 ways as a sum of consecutive naturals, for example, 183070 + ... + 190556.

It is an arithmetic number, because the mean of its divisors is an integer number (38413440).

Almost surely, 2^1398668931 is an apocalyptic number.

1398668931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1398668931 is a deficient number, since it is larger than the sum of its proper divisors (1059791229).

1398668931 is a wasteful number, since it uses less digits than its factorization.

1398668931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7561 (or 7555 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 1398668931 is about 37398.7824801824. The cubic root of 1398668931 is about 1118.3342934307.

The spelling of 1398668931 in words is "one billion, three hundred ninety-eight million, six hundred sixty-eight thousand, nine hundred thirty-one".