79898381 has 4 divisors (see below), whose sum is σ = 81847164. Its totient is φ = 77949600.

The previous prime is 79898369. The next prime is 79898387. The reversal of 79898381 is 18389897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18389897 = 463 ⋅39719.

It can be written as a sum of positive squares in 2 ways, for example, as 41396356 + 38502025 = 6434^2 + 6205^2 .

It is a cyclic number.

It is not a de Polignac number, because 79898381 - 2¹⁰ = 79897357 is a prime.

It is a super-2 number, since 2×79898381² = 12767502572842322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79898387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974330 + ... + 974411.

It is an arithmetic number, because the mean of its divisors is an integer number (20461791).

Almost surely, 2^79898381 is an apocalyptic number.

It is an amenable number.

79898381 is a deficient number, since it is larger than the sum of its proper divisors (1948783).

79898381 is a wasteful number, since it uses less digits than its factorization.

79898381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948782.

The product of its digits is 870912, while the sum is 53.

The square root of 79898381 is about 8938.5894301058. The cubic root of 79898381 is about 430.7044177876.

The spelling of 79898381 in words is "seventy-nine million, eight hundred ninety-eight thousand, three hundred eighty-one".