617420387 has 2 divisors, whose sum is σ = 617420388. Its totient is φ = 617420386.

The previous prime is 617420351. The next prime is 617420407. The reversal of 617420387 is 783024716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 617420387 - 2⁸ = 617420131 is a prime.

It is equal to p_32185982 and since 617420387 and 32185982 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 617420387.

It is not a weakly prime, because it can be changed into another prime (617420987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308710193 + 308710194.

It is an arithmetic number, because the mean of its divisors is an integer number (308710194).

Almost surely, 2^617420387 is an apocalyptic number.

617420387 is a deficient number, since it is larger than the sum of its proper divisors (1).

617420387 is an equidigital number, since it uses as much as digits as its factorization.

617420387 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 617420387 is about 24847.9453275316. The cubic root of 617420387 is about 851.5176517527.

The spelling of 617420387 in words is "six hundred seventeen million, four hundred twenty thousand, three hundred eighty-seven".