138434777 has 8 divisors (see below), whose sum is σ = 154224840. Its totient is φ = 123379200.

The previous prime is 138434771. The next prime is 138434789. The reversal of 138434777 is 777434831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 583696 + 137851081 = 764^2 + 11741^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138434777 - 2⁴ = 138434761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138434771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183224 + ... + 183977.

It is an arithmetic number, because the mean of its divisors is an integer number (19278105).

Almost surely, 2^138434777 is an apocalyptic number.

It is an amenable number.

138434777 is a deficient number, since it is larger than the sum of its proper divisors (15790063).

138434777 is a wasteful number, since it uses less digits than its factorization.

138434777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367243.

The product of its digits is 395136, while the sum is 44.

The square root of 138434777 is about 11765.8309098848. The cubic root of 138434777 is about 517.3070555814.

The spelling of 138434777 in words is "one hundred thirty-eight million, four hundred thirty-four thousand, seven hundred seventy-seven".