740921 has 6 divisors (see below), whose sum is σ = 768222. Its totient is φ = 714560.

The previous prime is 740903. The next prime is 740923. The reversal of 740921 is 129047.

It can be written as a sum of positive squares in 3 ways, for example, as 42025 + 698896 = 205^2 + 836^2 .

It is a de Polignac number, because none of the positive numbers 2^k-740921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (740923) 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 in 5 ways as a sum of consecutive naturals, for example, 401 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (128037).

2⁷⁴⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

740921 is a deficient number, since it is larger than the sum of its proper divisors (27301).

740921 is an equidigital number, since it uses as much as digits as its factorization.

740921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 740921 is about 860.7676806200. The cubic root of 740921 is about 90.4879261082.

Adding to 740921 its reverse (129047), we get a palindrome (869968).

It can be divided in two parts, 740 and 921, that added together give a palindrome (1661).

The spelling of 740921 in words is "seven hundred forty thousand, nine hundred twenty-one".