247057138 has 8 divisors (see below), whose sum is σ = 375805440. Its totient is φ = 121788660.

The previous prime is 247057121. The next prime is 247057201. The reversal of 247057138 is 831750742.

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

It is a super-2 number, since 2×247057138² = 122074458873502088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247057097 and 247057106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869778 + ... + 870061.

It is an arithmetic number, because the mean of its divisors is an integer number (46975680).

Almost surely, 2^247057138 is an apocalyptic number.

247057138 is a deficient number, since it is larger than the sum of its proper divisors (128748302).

247057138 is a wasteful number, since it uses less digits than its factorization.

247057138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739912.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 247057138 is about 15718.0513423261. The cubic root of 247057138 is about 627.4789127478.

The spelling of 247057138 in words is "two hundred forty-seven million, fifty-seven thousand, one hundred thirty-eight".