740443621 has 2 divisors, whose sum is σ = 740443622. Its totient is φ = 740443620.

The previous prime is 740443601. The next prime is 740443663. The reversal of 740443621 is 126344047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661055521 + 79388100 = 25711^2 + 8910^2 .

It is a cyclic number.

It is not a de Polignac number, because 740443621 - 2⁵ = 740443589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740443601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370221810 + 370221811.

It is an arithmetic number, because the mean of its divisors is an integer number (370221811).

Almost surely, 2^740443621 is an apocalyptic number.

It is an amenable number.

740443621 is a deficient number, since it is larger than the sum of its proper divisors (1).

740443621 is an equidigital number, since it uses as much as digits as its factorization.

740443621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 740443621 is about 27211.0937119404. The cubic root of 740443621 is about 904.6848799610.

Adding to 740443621 its reverse (126344047), we get a palindrome (866787668).

The spelling of 740443621 in words is "seven hundred forty million, four hundred forty-three thousand, six hundred twenty-one".