740777021 has 2 divisors, whose sum is σ = 740777022. Its totient is φ = 740777020.

The previous prime is 740776951. The next prime is 740777027. The reversal of 740777021 is 120777047.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604471396 + 136305625 = 24586^2 + 11675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740777021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (740777027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 370388510 + 370388511.

It is an arithmetic number, because the mean of its divisors is an integer number (370388511).

Almost surely, 2^740777021 is an apocalyptic number.

It is an amenable number.

740777021 is a deficient number, since it is larger than the sum of its proper divisors (1).

740777021 is an equidigital number, since it uses as much as digits as its factorization.

740777021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19208, while the sum is 35.

The square root of 740777021 is about 27217.2192003518. The cubic root of 740777021 is about 904.8206439234.

The spelling of 740777021 in words is "seven hundred forty million, seven hundred seventy-seven thousand, twenty-one".