740073821 has 8 divisors (see below), whose sum is σ = 772430904. Its totient is φ = 708398080.

The previous prime is 740073811. The next prime is 740073839. The reversal of 740073821 is 128370047.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14364100 + 725709721 = 3790^2 + 26939^2 .

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 740073821 - 2¹⁰ = 740072797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (740073811) 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, 168116 + ... + 172461.

It is an arithmetic number, because the mean of its divisors is an integer number (96553863).

Almost surely, 2^740073821 is an apocalyptic number.

It is an amenable number.

740073821 is a deficient number, since it is larger than the sum of its proper divisors (32357083).

740073821 is a wasteful number, since it uses less digits than its factorization.

740073821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340671.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 740073821 is about 27204.2978405986. The cubic root of 740073821 is about 904.5342458592.

The spelling of 740073821 in words is "seven hundred forty million, seventy-three thousand, eight hundred twenty-one".