1421166078 has 48 divisors (see below), whose sum is σ = 3209715600. Its totient is φ = 454025088.

The previous prime is 1421166059. The next prime is 1421166101. The reversal of 1421166078 is 8706611241.

It is a happy number.

1421166078 is a `hidden beast` number, since 1 + 42 + 1 + 1 + 6 + 607 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28698 + ... + 60546.

It is an arithmetic number, because the mean of its divisors is an integer number (66869075).

Almost surely, 2^1421166078 is an apocalyptic number.

1421166078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421166078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1604857800).

1421166078 is an abundant number, since it is smaller than the sum of its proper divisors (1788549522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1421166078 is a wasteful number, since it uses less digits than its factorization.

1421166078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31961 (or 31958 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1421166078 is about 37698.3564363223. The cubic root of 1421166078 is about 1124.2984473418.

The spelling of 1421166078 in words is "one billion, four hundred twenty-one million, one hundred sixty-six thousand, seventy-eight".