247891138 has 16 divisors (see below), whose sum is σ = 426990240. Its totient is φ = 106747200.

The previous prime is 247891121. The next prime is 247891139. The reversal of 247891138 is 831198742.

It is a super-2 number, since 2×247891138² = 122900032597870088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247891094 and 247891103.

It is not an unprimeable number, because it can be changed into a prime (247891139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296103 + ... + 296938.

It is an arithmetic number, because the mean of its divisors is an integer number (26686890).

Almost surely, 2^247891138 is an apocalyptic number.

247891138 is a deficient number, since it is larger than the sum of its proper divisors (179099102).

247891138 is a wasteful number, since it uses less digits than its factorization.

247891138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593073.

The product of its digits is 96768, while the sum is 43.

The square root of 247891138 is about 15744.5589966820. The cubic root of 247891138 is about 628.1841877281.

The spelling of 247891138 in words is "two hundred forty-seven million, eight hundred ninety-one thousand, one hundred thirty-eight".