426957781 has 4 divisors (see below), whose sum is σ = 429343200. Its totient is φ = 424572364.

The previous prime is 426957779. The next prime is 426957829. The reversal of 426957781 is 187759624.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 426957781 - 2¹ = 426957779 is a prime.

It is a super-2 number, since 2×426957781² = 364585893512887922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426957281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192441 + ... + 1192798.

It is an arithmetic number, because the mean of its divisors is an integer number (107335800).

Almost surely, 2^426957781 is an apocalyptic number.

It is an amenable number.

426957781 is a deficient number, since it is larger than the sum of its proper divisors (2385419).

426957781 is a wasteful number, since it uses less digits than its factorization.

426957781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385418.

The product of its digits is 846720, while the sum is 49.

The square root of 426957781 is about 20662.9567342140. The cubic root of 426957781 is about 753.0000023515. Note that the first 5 decimals are identical.

The spelling of 426957781 in words is "four hundred twenty-six million, nine hundred fifty-seven thousand, seven hundred eighty-one".