1378118731 has 16 divisors (see below), whose sum is σ = 1526220000. Its totient is φ = 1244247840.

The previous prime is 1378118699. The next prime is 1378118737.

1378118731 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1378118731 - 2⁵ = 1378118699 is a prime.

It is a super-2 number, since 2×1378118731² = 3798422473466100722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378118737) 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 15 ways as a sum of consecutive naturals, for example, 194845 + ... + 201793.

It is an arithmetic number, because the mean of its divisors is an integer number (95388750).

Almost surely, 2^1378118731 is an apocalyptic number.

1378118731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1378118731 is a deficient number, since it is larger than the sum of its proper divisors (148101269).

1378118731 is an equidigital number, since it uses as much as digits as its factorization.

1378118731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7131 (or 7109 counting only the distinct ones).

The product of its digits is 28224, while the sum is 40.

The square root of 1378118731 is about 37123.0215769137. The cubic root of 1378118731 is about 1112.8301371936.

The spelling of 1378118731 in words is "one billion, three hundred seventy-eight million, one hundred eighteen thousand, seven hundred thirty-one".