102420779 has 8 divisors (see below), whose sum is σ = 106218000. Its totient is φ = 98641312.

The previous prime is 102420763. The next prime is 102420781. The reversal of 102420779 is 977024201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 102420779 - 2⁴ = 102420763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102420719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7937 + ... + 16365.

It is an arithmetic number, because the mean of its divisors is an integer number (13277250).

Almost surely, 2^102420779 is an apocalyptic number.

102420779 is a deficient number, since it is larger than the sum of its proper divisors (3797221).

102420779 is an equidigital number, since it uses as much as digits as its factorization.

102420779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8877.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 102420779 is about 10120.3151630767. The cubic root of 102420779 is about 467.8744808512.

The spelling of 102420779 in words is "one hundred two million, four hundred twenty thousand, seven hundred seventy-nine".