866421431 has 16 divisors (see below), whose sum is σ = 922821120. Its totient is φ = 811689120.

The previous prime is 866421419. The next prime is 866421463. The reversal of 866421431 is 134124668.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866421431 is a prime.

It is a super-2 number, since 2×866421431² = 1501372192192175522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866421391 and 866421400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866421401) 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, 421001 + ... + 423053.

It is an arithmetic number, because the mean of its divisors is an integer number (57676320).

Almost surely, 2^866421431 is an apocalyptic number.

866421431 is a deficient number, since it is larger than the sum of its proper divisors (56399689).

866421431 is a wasteful number, since it uses less digits than its factorization.

866421431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446.

The product of its digits is 27648, while the sum is 35.

The square root of 866421431 is about 29435.0374723730. The cubic root of 866421431 is about 953.3295656390.

The spelling of 866421431 in words is "eight hundred sixty-six million, four hundred twenty-one thousand, four hundred thirty-one".