247161138 has 64 divisors (see below), whose sum is σ = 576860160. Its totient is φ = 69144192.

The previous prime is 247161127. The next prime is 247161143. The reversal of 247161138 is 831161742.

It is a super-2 number, since 2×247161138² = 122177256274910088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247161099 and 247161108.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 540606 + ... + 541062.

It is an arithmetic number, because the mean of its divisors is an integer number (9013440).

Almost surely, 2^247161138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247161138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288430080).

247161138 is an abundant number, since it is smaller than the sum of its proper divisors (329699022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247161138 is a wasteful number, since it uses less digits than its factorization.

247161138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711.

The product of its digits is 8064, while the sum is 33.

The square root of 247161138 is about 15721.3592923767. The cubic root of 247161138 is about 627.5669472442.

The spelling of 247161138 in words is "two hundred forty-seven million, one hundred sixty-one thousand, one hundred thirty-eight".