1420867681 has 4 divisors (see below), whose sum is σ = 1421135872. Its totient is φ = 1420599492.

The previous prime is 1420867663. The next prime is 1420867687. The reversal of 1420867681 is 1867680241.

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 1420867681 - 2⁹ = 1420867169 is a prime.

It is a super-2 number, since 2×1420867681² = 4037729933820635522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1420867687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125985 + ... + 136798.

It is an arithmetic number, because the mean of its divisors is an integer number (355283968).

Almost surely, 2^1420867681 is an apocalyptic number.

It is an amenable number.

1420867681 is a deficient number, since it is larger than the sum of its proper divisors (268191).

1420867681 is an equidigital number, since it uses as much as digits as its factorization.

1420867681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268190.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 1420867681 is about 37694.3985361220. The cubic root of 1420867681 is about 1124.2197535677.

The spelling of 1420867681 in words is "one billion, four hundred twenty million, eight hundred sixty-seven thousand, six hundred eighty-one".