8400979 has 2 divisors, whose sum is σ = 8400980. Its totient is φ = 8400978.

The previous prime is 8400971. The next prime is 8401013. The reversal of 8400979 is 9790048.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8400979 - 2³ = 8400971 is a prime.

It is a super-4 number, since 4×8400979⁴ (a number of 29 digits) contains 4444 as substring.

It is a d-powerful number, because it can be written as 8⁷ + 4⁵ + 0 + 0 + 9⁴ + 7⁸ + 9⁶ .

It is not a weakly prime, because it can be changed into another prime (8400971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4200489 + 4200490.

It is an arithmetic number, because the mean of its divisors is an integer number (4200490).

Almost surely, 2^8400979 is an apocalyptic number.

8400979 is a deficient number, since it is larger than the sum of its proper divisors (1).

8400979 is an equidigital number, since it uses as much as digits as its factorization.

8400979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 8400979 is about 2898.4442378628. Note that the first 3 decimals coincide. The cubic root of 8400979 is about 203.2871682945.

The spelling of 8400979 in words is "eight million, four hundred thousand, nine hundred seventy-nine".