2398949781 has 8 divisors (see below), whose sum is σ = 3386752704. Its totient is φ = 1505223360.

The previous prime is 2398949779. The next prime is 2398949783. The reversal of 2398949781 is 1879498932.

It is an interprime number because it is at equal distance from previous prime (2398949779) and next prime (2398949783).

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

It is not a de Polignac number, because 2398949781 - 2¹ = 2398949779 is a prime.

It is a super-2 number, since 2×2398949781² = 11509920103519895922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2398949783) 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, 23519065 + ... + 23519166.

It is an arithmetic number, because the mean of its divisors is an integer number (423344088).

Almost surely, 2^2398949781 is an apocalyptic number.

It is an amenable number.

2398949781 is a deficient number, since it is larger than the sum of its proper divisors (987802923).

2398949781 is a wasteful number, since it uses less digits than its factorization.

2398949781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47038251.

The product of its digits is 7838208, while the sum is 60.

The square root of 2398949781 is about 48979.0749300148. The cubic root of 2398949781 is about 1338.6705796704.

The spelling of 2398949781 in words is "two billion, three hundred ninety-eight million, nine hundred forty-nine thousand, seven hundred eighty-one".