138309477 has 8 divisors (see below), whose sum is σ = 185865216. Its totient is φ = 91480032.

The previous prime is 138309469. The next prime is 138309517. The reversal of 138309477 is 774903831.

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

It is not a de Polignac number, because 138309477 - 2³ = 138309469 is a prime.

It is a super-2 number, since 2×138309477² = 38259022856027058, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138309427) 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, 181128 + ... + 181889.

It is an arithmetic number, because the mean of its divisors is an integer number (23233152).

Almost surely, 2^138309477 is an apocalyptic number.

It is an amenable number.

138309477 is a deficient number, since it is larger than the sum of its proper divisors (47555739).

138309477 is a wasteful number, since it uses less digits than its factorization.

138309477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363147.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 138309477 is about 11760.5049636485. The cubic root of 138309477 is about 517.1509335879.

The spelling of 138309477 in words is "one hundred thirty-eight million, three hundred nine thousand, four hundred seventy-seven".