1078685421 has 16 divisors (see below), whose sum is σ = 1623101760. Its totient is φ = 631205120.

The previous prime is 1078685417. The next prime is 1078685477. The reversal of 1078685421 is 1245868701.

1078685421 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1078685421 - 2² = 1078685417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1078685221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562620 + ... + 564533.

It is an arithmetic number, because the mean of its divisors is an integer number (101443860).

Almost surely, 2^1078685421 is an apocalyptic number.

1078685421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1078685421 is a deficient number, since it is larger than the sum of its proper divisors (544416339).

1078685421 is a wasteful number, since it uses less digits than its factorization.

1078685421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127196.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 1078685421 is about 32843.3466778281. The cubic root of 1078685421 is about 1025.5691214992.

The spelling of 1078685421 in words is "one billion, seventy-eight million, six hundred eighty-five thousand, four hundred twenty-one".