749981421 has 12 divisors (see below), whose sum is σ = 1238064672. Its totient is φ = 428560776.

The previous prime is 749981381. The next prime is 749981431. The reversal of 749981421 is 124189947.

It is a happy number.

It is not a de Polignac number, because 749981421 - 2⁷ = 749981293 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749981431) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5952171 + ... + 5952296.

It is an arithmetic number, because the mean of its divisors is an integer number (103172056).

Almost surely, 2^749981421 is an apocalyptic number.

It is an amenable number.

749981421 is a deficient number, since it is larger than the sum of its proper divisors (488083251).

749981421 is a wasteful number, since it uses less digits than its factorization.

749981421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11904480 (or 11904477 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 749981421 is about 27385.7886685777. The cubic root of 749981421 is about 908.5527940689.

The spelling of 749981421 in words is "seven hundred forty-nine million, nine hundred eighty-one thousand, four hundred twenty-one".