1378636986 has 16 divisors (see below), whose sum is σ = 2757696768. Its totient is φ = 459475200.

The previous prime is 1378636933. The next prime is 1378636993. The reversal of 1378636986 is 6896368731.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38551 + ... + 65141.

It is an arithmetic number, because the mean of its divisors is an integer number (172356048).

Almost surely, 2^1378636986 is an apocalyptic number.

1378636986 is an abundant number, since it is smaller than the sum of its proper divisors (1379059782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1378636986 is a wasteful number, since it uses less digits than its factorization.

1378636986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35237.

The product of its digits is 7838208, while the sum is 57.

The square root of 1378636986 is about 37130.0011580932. The cubic root of 1378636986 is about 1112.9696165892.

The spelling of 1378636986 in words is "one billion, three hundred seventy-eight million, six hundred thirty-six thousand, nine hundred eighty-six".