1678412421 has 56 divisors (see below), whose sum is σ = 2943230400. Its totient is φ = 936665856.

The previous prime is 1678412413. The next prime is 1678412429. The reversal of 1678412421 is 1242148761.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1678412413) and next prime (1678412429).

It is not a de Polignac number, because 1678412421 - 2³ = 1678412413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678412429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 215605 + ... + 223253.

Almost surely, 2^1678412421 is an apocalyptic number.

It is an amenable number.

1678412421 is a deficient number, since it is larger than the sum of its proper divisors (1264817979).

1678412421 is an frugal number, since it uses more digits than its factorization.

1678412421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7717 (or 7702 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 1678412421 is about 40968.4320056309. The cubic root of 1678412421 is about 1188.4098104069.

The spelling of 1678412421 in words is "one billion, six hundred seventy-eight million, four hundred twelve thousand, four hundred twenty-one".