247074138 has 72 divisors (see below), whose sum is σ = 585736320. Its totient is φ = 77944680.

The previous prime is 247074131. The next prime is 247074143. The reversal of 247074138 is 831470742.

It is a happy number.

It is a super-2 number, since 2×247074138² = 122091259336886088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247074131) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 248823 + ... + 249813.

Almost surely, 2^247074138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247074138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292868160).

247074138 is an abundant number, since it is smaller than the sum of its proper divisors (338662182).

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

247074138 is an frugal number, since it uses more digits than its factorization.

247074138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036 (or 1015 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 247074138 is about 15718.5921125271. The cubic root of 247074138 is about 627.4933046909.

The spelling of 247074138 in words is "two hundred forty-seven million, seventy-four thousand, one hundred thirty-eight".