2390638781 has 8 divisors (see below), whose sum is σ = 2412788928. Its totient is φ = 2368548000.

The previous prime is 2390638771. The next prime is 2390638801. The reversal of 2390638781 is 1878360932.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2390638781 is a prime.

It is a super-2 number, since 2×2390638781² = 11430307562442331922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2390638741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68201 + ... + 97121.

It is an arithmetic number, because the mean of its divisors is an integer number (301598616).

Almost surely, 2^2390638781 is an apocalyptic number.

It is an amenable number.

2390638781 is a deficient number, since it is larger than the sum of its proper divisors (22150147).

2390638781 is a wasteful number, since it uses less digits than its factorization.

2390638781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29683.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 2390638781 is about 48894.1589660769. The cubic root of 2390638781 is about 1337.1228796267.

The spelling of 2390638781 in words is "two billion, three hundred ninety million, six hundred thirty-eight thousand, seven hundred eighty-one".