1421026857 has 24 divisors (see below), whose sum is σ = 2075416200. Its totient is φ = 936875520.

The previous prime is 1421026819. The next prime is 1421026861. The reversal of 1421026857 is 7586201241.

It can be written as a sum of positive squares in 4 ways, for example, as 121352256 + 1299674601 = 11016^2 + 36051^2 .

It is not a de Polignac number, because 1421026857 - 2⁷ = 1421026729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1421006857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 320983 + ... + 325379.

It is an arithmetic number, because the mean of its divisors is an integer number (86475675).

Almost surely, 2^1421026857 is an apocalyptic number.

It is an amenable number.

1421026857 is a deficient number, since it is larger than the sum of its proper divisors (654389343).

1421026857 is a wasteful number, since it uses less digits than its factorization.

1421026857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4793 (or 4790 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1421026857 is about 37696.5098782367. The cubic root of 1421026857 is about 1124.2617331092.

The spelling of 1421026857 in words is "one billion, four hundred twenty-one million, twenty-six thousand, eight hundred fifty-seven".