73878397 has 2 divisors, whose sum is σ = 73878398. Its totient is φ = 73878396.

The previous prime is 73878353. The next prime is 73878437. The reversal of 73878397 is 79387837.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37625956 + 36252441 = 6134^2 + 6021^2 .

It is an emirp because it is prime and its reverse (79387837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73878397 - 2¹⁹ = 73354109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73878197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36939198 + 36939199.

It is an arithmetic number, because the mean of its divisors is an integer number (36939199).

Almost surely, 2^73878397 is an apocalyptic number.

It is an amenable number.

73878397 is a deficient number, since it is larger than the sum of its proper divisors (1).

73878397 is an equidigital number, since it uses as much as digits as its factorization.

73878397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 52.

The square root of 73878397 is about 8595.2543301522. The cubic root of 73878397 is about 419.6035506907.

The spelling of 73878397 in words is "seventy-three million, eight hundred seventy-eight thousand, three hundred ninety-seven".