6398450749 has 4 divisors (see below), whose sum is σ = 6407063136. Its totient is φ = 6389838364.

The previous prime is 6398450731. The next prime is 6398450759. The reversal of 6398450749 is 9470548936.

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.

It is a cyclic number.

It is not a de Polignac number, because 6398450749 - 2⁹ = 6398450237 is a prime.

It is a super-2 number, since 2×6398450749² = 81880343974757322002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6398450749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398450719) 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, 4305079 + ... + 4306564.

It is an arithmetic number, because the mean of its divisors is an integer number (1601765784).

Almost surely, 2^6398450749 is an apocalyptic number.

It is an amenable number.

6398450749 is a deficient number, since it is larger than the sum of its proper divisors (8612387).

6398450749 is an equidigital number, since it uses as much as digits as its factorization.

6398450749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8612386.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The square root of 6398450749 is about 79990.3165951979. The cubic root of 6398450749 is about 1856.4857091438.

The spelling of 6398450749 in words is "six billion, three hundred ninety-eight million, four hundred fifty thousand, seven hundred forty-nine".