767981421 has 24 divisors (see below), whose sum is σ = 1119998880. Its totient is φ = 507077856.

The previous prime is 767981413. The next prime is 767981429. The reversal of 767981421 is 124189767.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (767981413) and next prime (767981429).

It is not a de Polignac number, because 767981421 - 2³ = 767981413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (767981429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 471210 + ... + 472836.

It is an arithmetic number, because the mean of its divisors is an integer number (46666620).

Almost surely, 2^767981421 is an apocalyptic number.

It is an amenable number.

767981421 is a deficient number, since it is larger than the sum of its proper divisors (352017459).

767981421 is a wasteful number, since it uses less digits than its factorization.

767981421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105 (or 2102 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 767981421 is about 27712.4777131169. The cubic root of 767981421 is about 915.7640093838.

The spelling of 767981421 in words is "seven hundred sixty-seven million, nine hundred eighty-one thousand, four hundred twenty-one".