247127138 has 4 divisors (see below), whose sum is σ = 370690710. Its totient is φ = 123563568.

The previous prime is 247127137. The next prime is 247127143. The reversal of 247127138 is 831721742.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 130119649 + 117007489 = 11407^2 + 10817^2 .

It is a super-2 number, since 2×247127138² = 122143644672142088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247127098 and 247127107.

It is not an unprimeable number, because it can be changed into a prime (247127137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61781783 + ... + 61781786.

Almost surely, 2^247127138 is an apocalyptic number.

247127138 is a deficient number, since it is larger than the sum of its proper divisors (123563572).

247127138 is a wasteful number, since it uses less digits than its factorization.

247127138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123563571.

The product of its digits is 18816, while the sum is 35.

The square root of 247127138 is about 15720.2779237519. The cubic root of 247127138 is about 627.5381694532.

The spelling of 247127138 in words is "two hundred forty-seven million, one hundred twenty-seven thousand, one hundred thirty-eight".