749040638 has 32 divisors (see below), whose sum is σ = 1208735136. Its totient is φ = 346871808.

The previous prime is 749040541. The next prime is 749040653. The reversal of 749040638 is 836040947.

It is a super-2 number, since 2×749040638² = 1122123754750894088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 749040595 and 749040604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1221620 + ... + 1222232.

It is an arithmetic number, because the mean of its divisors is an integer number (37772973).

Almost surely, 2^749040638 is an apocalyptic number.

749040638 is a deficient number, since it is larger than the sum of its proper divisors (459694498).

749040638 is a wasteful number, since it uses less digits than its factorization.

749040638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 749040638 is about 27368.6067968393. The cubic root of 749040638 is about 908.1727363542.

The spelling of 749040638 in words is "seven hundred forty-nine million, forty thousand, six hundred thirty-eight".