7813898 has 4 divisors (see below), whose sum is σ = 11720850. Its totient is φ = 3906948.

The previous prime is 7813879. The next prime is 7813907. The reversal of 7813898 is 8983187.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7656289 + 157609 = 2767^2 + 397^2 .

It is a super-2 number, since 2×7813898² = 122114003908808, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1953473 + ... + 1953476.

Almost surely, 2^7813898 is an apocalyptic number.

7813898 is a deficient number, since it is larger than the sum of its proper divisors (3906952).

7813898 is a wasteful number, since it uses less digits than its factorization.

7813898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906951.

The product of its digits is 96768, while the sum is 44.

The square root of 7813898 is about 2795.3350425307. The cubic root of 7813898 is about 198.4369664524.

The spelling of 7813898 in words is "seven million, eight hundred thirteen thousand, eight hundred ninety-eight".