426689978 has 32 divisors (see below), whose sum is σ = 762556032. Its totient is φ = 176500800.

The previous prime is 426689933. The next prime is 426690023. The reversal of 426689978 is 879986624.

It is an interprime number because it is at equal distance from previous prime (426689933) and next prime (426690023).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9800 + ... + 30812.

It is an arithmetic number, because the mean of its divisors is an integer number (23829876).

Almost surely, 2^426689978 is an apocalyptic number.

426689978 is a deficient number, since it is larger than the sum of its proper divisors (335866054).

426689978 is a wasteful number, since it uses less digits than its factorization.

426689978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21110.

The product of its digits is 10450944, while the sum is 59.

The square root of 426689978 is about 20656.4754496018. The cubic root of 426689978 is about 752.8425333580.

The spelling of 426689978 in words is "four hundred twenty-six million, six hundred eighty-nine thousand, nine hundred seventy-eight".