138451378 has 32 divisors (see below), whose sum is σ = 230356224. Its totient is φ = 62009472.

The previous prime is 138451351. The next prime is 138451433. The reversal of 138451378 is 873154831.

It is a self number, because there is not a number n which added to its sum of digits gives 138451378.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167001 + ... + 167827.

It is an arithmetic number, because the mean of its divisors is an integer number (7198632).

Almost surely, 2^138451378 is an apocalyptic number.

138451378 is a deficient number, since it is larger than the sum of its proper divisors (91904846).

138451378 is a wasteful number, since it uses less digits than its factorization.

138451378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026.

The product of its digits is 80640, while the sum is 40.

The square root of 138451378 is about 11766.5363637733. The cubic root of 138451378 is about 517.3277331196.

The spelling of 138451378 in words is "one hundred thirty-eight million, four hundred fifty-one thousand, three hundred seventy-eight".