247138992 has 80 divisors (see below), whose sum is σ = 712335360. Its totient is φ = 82036800.

The previous prime is 247138981. The next prime is 247139003. The reversal of 247138992 is 299831742.

247138992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (247138981) and next prime (247139003).

It is a super-2 number, since 2×247138992² = 122155362733552128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116017 + ... + 118127.

It is an arithmetic number, because the mean of its divisors is an integer number (8904192).

Almost surely, 2^247138992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247138992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356167680).

247138992 is an abundant number, since it is smaller than the sum of its proper divisors (465196368).

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

247138992 is a wasteful number, since it uses less digits than its factorization.

247138992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399 (or 2387 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 247138992 is about 15720.6549481884. The cubic root of 247138992 is about 627.5482030451.

The spelling of 247138992 in words is "two hundred forty-seven million, one hundred thirty-eight thousand, nine hundred ninety-two".