742706381 has 2 divisors, whose sum is σ = 742706382. Its totient is φ = 742706380.

The previous prime is 742706369. The next prime is 742706389. The reversal of 742706381 is 183607247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690375625 + 52330756 = 26275^2 + 7234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-742706381 is a prime.

It is a super-2 number, since 2×742706381² = 1103225536756234322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (742706389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371353190 + 371353191.

It is an arithmetic number, because the mean of its divisors is an integer number (371353191).

Almost surely, 2^742706381 is an apocalyptic number.

It is an amenable number.

742706381 is a deficient number, since it is larger than the sum of its proper divisors (1).

742706381 is an equidigital number, since it uses as much as digits as its factorization.

742706381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 742706381 is about 27252.6398904767. The cubic root of 742706381 is about 905.6055005952.

The spelling of 742706381 in words is "seven hundred forty-two million, seven hundred six thousand, three hundred eighty-one".