687398419 has 2 divisors, whose sum is σ = 687398420. Its totient is φ = 687398418.

The previous prime is 687398351. The next prime is 687398423. The reversal of 687398419 is 914893786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687398419 is a prime.

It is a super-2 number, since 2×687398419² = 945033172887399122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 687398419.

It is not a weakly prime, because it can be changed into another prime (687398479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343699209 + 343699210.

It is an arithmetic number, because the mean of its divisors is an integer number (343699210).

Almost surely, 2^687398419 is an apocalyptic number.

687398419 is a deficient number, since it is larger than the sum of its proper divisors (1).

687398419 is an equidigital number, since it uses as much as digits as its factorization.

687398419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 55.

The square root of 687398419 is about 26218.2840590303. The cubic root of 687398419 is about 882.5436130463.

The spelling of 687398419 in words is "six hundred eighty-seven million, three hundred ninety-eight thousand, four hundred nineteen".