1368639138 has 16 divisors (see below), whose sum is σ = 2743273440. Its totient is φ = 455213856.

The previous prime is 1368639109. The next prime is 1368639143. The reversal of 1368639138 is 8319368631.

It is a happy number.

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, 246828 + ... + 252311.

It is an arithmetic number, because the mean of its divisors is an integer number (171454590).

Almost surely, 2^1368639138 is an apocalyptic number.

1368639138 is an abundant number, since it is smaller than the sum of its proper divisors (1374634302).

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

1368639138 is a wasteful number, since it uses less digits than its factorization.

1368639138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499601.

The product of its digits is 559872, while the sum is 48.

The square root of 1368639138 is about 36995.1231650876. The cubic root of 1368639138 is about 1110.2726754830.

The spelling of 1368639138 in words is "one billion, three hundred sixty-eight million, six hundred thirty-nine thousand, one hundred thirty-eight".