138434378 has 8 divisors (see below), whose sum is σ = 216679968. Its totient is φ = 66207724.

The previous prime is 138434347. The next prime is 138434407. The reversal of 138434378 is 873434831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1504676 + ... + 1504767.

It is an arithmetic number, because the mean of its divisors is an integer number (27084996).

Almost surely, 2^138434378 is an apocalyptic number.

138434378 is a deficient number, since it is larger than the sum of its proper divisors (78245590).

138434378 is a wasteful number, since it uses less digits than its factorization.

138434378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009468.

The product of its digits is 193536, while the sum is 41.

The square root of 138434378 is about 11765.8139539940. The cubic root of 138434378 is about 517.3065585827.

The spelling of 138434378 in words is "one hundred thirty-eight million, four hundred thirty-four thousand, three hundred seventy-eight".