749840638 has 4 divisors (see below), whose sum is σ = 1124760960. Its totient is φ = 374920318.

The previous prime is 749840633. The next prime is 749840653. The reversal of 749840638 is 836048947.

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

It is a junction number, because it is equal to n+sod(n) for n = 749840591 and 749840600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749840633) 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 as a sum of consecutive naturals, namely, 187460158 + ... + 187460161.

It is an arithmetic number, because the mean of its divisors is an integer number (281190240).

Almost surely, 2^749840638 is an apocalyptic number.

749840638 is a deficient number, since it is larger than the sum of its proper divisors (374920322).

749840638 is a wasteful number, since it uses less digits than its factorization.

749840638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374920321.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 749840638 is about 27383.2181819449. The cubic root of 749840638 is about 908.4959407528.

The spelling of 749840638 in words is "seven hundred forty-nine million, eight hundred forty thousand, six hundred thirty-eight".