766340421 has 32 divisors (see below), whose sum is σ = 1276025856. Its totient is φ = 397440000.

The previous prime is 766340413. The next prime is 766340431. The reversal of 766340421 is 124043667.

It is a happy number.

It is not a de Polignac number, because 766340421 - 2³ = 766340413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766340401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157221 + ... + 162021.

It is an arithmetic number, because the mean of its divisors is an integer number (39875808).

Almost surely, 2^766340421 is an apocalyptic number.

It is an amenable number.

766340421 is a deficient number, since it is larger than the sum of its proper divisors (509685435).

766340421 is a wasteful number, since it uses less digits than its factorization.

766340421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 766340421 is about 27682.8542784157. The cubic root of 766340421 is about 915.1112851000. Note that the first 3 decimals are identical.

It can be divided in two parts, 7663 and 40421, that added together give a palindrome (48084).

The spelling of 766340421 in words is "seven hundred sixty-six million, three hundred forty thousand, four hundred twenty-one".