247979238 has 128 divisors (see below), whose sum is σ = 606154752. Its totient is φ = 66840576.

The previous prime is 247979233. The next prime is 247979243. The reversal of 247979238 is 832979742.

It is an interprime number because it is at equal distance from previous prime (247979233) and next prime (247979243).

It is a super-2 number, since 2×247979238² = 122987404958121288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247979233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1433320 + ... + 1433492.

It is an arithmetic number, because the mean of its divisors is an integer number (4735584).

Almost surely, 2^247979238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247979238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303077376).

247979238 is an abundant number, since it is smaller than the sum of its proper divisors (358175514).

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

247979238 is a wasteful number, since it uses less digits than its factorization.

247979238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278.

The product of its digits is 1524096, while the sum is 51.

The square root of 247979238 is about 15747.3565400673. The cubic root of 247979238 is about 628.2585973693.

The spelling of 247979238 in words is "two hundred forty-seven million, nine hundred seventy-nine thousand, two hundred thirty-eight".