83720387 has 2 divisors, whose sum is σ = 83720388. Its totient is φ = 83720386.

The previous prime is 83720383. The next prime is 83720411. The reversal of 83720387 is 78302738.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83720387 - 2² = 83720383 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83720387.

It is not a weakly prime, because it can be changed into another prime (83720383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41860193 + 41860194.

It is an arithmetic number, because the mean of its divisors is an integer number (41860194).

Almost surely, 2^83720387 is an apocalyptic number.

83720387 is a deficient number, since it is larger than the sum of its proper divisors (1).

83720387 is an equidigital number, since it uses as much as digits as its factorization.

83720387 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 83720387 is about 9149.8845347906. The cubic root of 83720387 is about 437.4654331329.

The spelling of 83720387 in words is "eighty-three million, seven hundred twenty thousand, three hundred eighty-seven".