7990188361 has 4 divisors (see below), whose sum is σ = 7990398592. Its totient is φ = 7989978132.

The previous prime is 7990188331. The next prime is 7990188397. The reversal of 7990188361 is 1638810997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1638810997 = 79 ⋅20744443.

It is a cyclic number.

It is not a de Polignac number, because 7990188361 - 2¹³ = 7990180169 is a prime.

It is a super-2 number, since 2×7990188361² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7990188299 and 7990188308.

It is not an unprimeable number, because it can be changed into a prime (7990188331) 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, 30405 + ... + 130018.

It is an arithmetic number, because the mean of its divisors is an integer number (1997599648).

Almost surely, 2^7990188361 is an apocalyptic number.

It is an amenable number.

7990188361 is a deficient number, since it is larger than the sum of its proper divisors (210231).

7990188361 is a wasteful number, since it uses less digits than its factorization.

7990188361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210230.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 7990188361 is about 89387.8535428612. The cubic root of 7990188361 is about 1999.1820289239.

The spelling of 7990188361 in words is "seven billion, nine hundred ninety million, one hundred eighty-eight thousand, three hundred sixty-one".