740621921 has 8 divisors (see below), whose sum is σ = 797810664. Its totient is φ = 683464320.

The previous prime is 740621897. The next prime is 740621927. The reversal of 740621921 is 129126047.

It is a happy number.

740621921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2739025 + 737882896 = 1655^2 + 27164^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 740621921 - 2⁶ = 740621857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (740621927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71831 + ... + 81491.

It is an arithmetic number, because the mean of its divisors is an integer number (99726333).

Almost surely, 2^740621921 is an apocalyptic number.

It is an amenable number.

740621921 is a deficient number, since it is larger than the sum of its proper divisors (57188743).

740621921 is a wasteful number, since it uses less digits than its factorization.

740621921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15571.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 740621921 is about 27214.3697520262. The cubic root of 740621921 is about 904.7574906517.

Adding to 740621921 its reverse (129126047), we get a palindrome (869747968).

The spelling of 740621921 in words is "seven hundred forty million, six hundred twenty-one thousand, nine hundred twenty-one".