1378999115 has 32 divisors (see below), whose sum is σ = 1910926080. Its totient is φ = 946243584.

The previous prime is 1378999099. The next prime is 1378999117. The reversal of 1378999115 is 5119998731.

It is not a de Polignac number, because 1378999115 - 2⁴ = 1378999099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1378999117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79397 + ... + 95193.

It is an arithmetic number, because the mean of its divisors is an integer number (59716440).

Almost surely, 2^1378999115 is an apocalyptic number.

1378999115 is a deficient number, since it is larger than the sum of its proper divisors (531926965).

1378999115 is a wasteful number, since it uses less digits than its factorization.

1378999115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15911.

The product of its digits is 612360, while the sum is 53.

The square root of 1378999115 is about 37134.8773392346. The cubic root of 1378999115 is about 1113.0670566198.

The spelling of 1378999115 in words is "one billion, three hundred seventy-eight million, nine hundred ninety-nine thousand, one hundred fifteen".