749978 has 4 divisors (see below), whose sum is σ = 1124970. Its totient is φ = 374988.

The previous prime is 749971. The next prime is 749993. The reversal of 749978 is 879947.

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

It can be written as a sum of positive squares in only one way, i.e., 683929 + 66049 = 827^2 + 257^2 .

It is not an unprimeable number, because it can be changed into a prime (749971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 187493 + ... + 187496.

2⁷⁴⁹⁹⁷⁸ is an apocalyptic number.

749978 is a deficient number, since it is larger than the sum of its proper divisors (374992).

749978 is a wasteful number, since it uses less digits than its factorization.

749978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374991.

The product of its digits is 127008, while the sum is 44.

The square root of 749978 is about 866.0127019854. The cubic root of 749978 is about 90.8551412629.

The spelling of 749978 in words is "seven hundred forty-nine thousand, nine hundred seventy-eight".