740627021 has 2 divisors, whose sum is σ = 740627022. Its totient is φ = 740627020.

The previous prime is 740627009. The next prime is 740627023. The reversal of 740627021 is 120726047.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529506121 + 211120900 = 23011^2 + 14530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740627021 is a prime.

Together with 740627023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740627023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370313510 + 370313511.

It is an arithmetic number, because the mean of its divisors is an integer number (370313511).

Almost surely, 2^740627021 is an apocalyptic number.

It is an amenable number.

740627021 is a deficient number, since it is larger than the sum of its proper divisors (1).

740627021 is an equidigital number, since it uses as much as digits as its factorization.

740627021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 740627021 is about 27214.4634523630. The cubic root of 740627021 is about 904.7595673985.

The spelling of 740627021 in words is "seven hundred forty million, six hundred twenty-seven thousand, twenty-one".