73403857 has 2 divisors, whose sum is σ = 73403858. Its totient is φ = 73403856.

The previous prime is 73403851. The next prime is 73403861. The reversal of 73403857 is 75830437.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65918161 + 7485696 = 8119^2 + 2736^2 .

It is an emirp because it is prime and its reverse (75830437) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73403857 is a prime.

It is not a weakly prime, because it can be changed into another prime (73403851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36701928 + 36701929.

It is an arithmetic number, because the mean of its divisors is an integer number (36701929).

Almost surely, 2^73403857 is an apocalyptic number.

It is an amenable number.

73403857 is a deficient number, since it is larger than the sum of its proper divisors (1).

73403857 is an equidigital number, since it uses as much as digits as its factorization.

73403857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 73403857 is about 8567.6050912726. The cubic root of 73403857 is about 418.7032129504.

The spelling of 73403857 in words is "seventy-three million, four hundred three thousand, eight hundred fifty-seven".