772140421 has 4 divisors (see below), whose sum is σ = 831535852. Its totient is φ = 712744992.

The previous prime is 772140419. The next prime is 772140443. The reversal of 772140421 is 124041277.

772140421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35832196 + 736308225 = 5986^2 + 27135^2 .

It is a cyclic number.

It is not a de Polignac number, because 772140421 - 2¹ = 772140419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 772140421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772140401) 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, 29697696 + ... + 29697721.

It is an arithmetic number, because the mean of its divisors is an integer number (207883963).

Almost surely, 2^772140421 is an apocalyptic number.

It is an amenable number.

772140421 is a deficient number, since it is larger than the sum of its proper divisors (59395431).

772140421 is a wasteful number, since it uses less digits than its factorization.

772140421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59395430.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 772140421 is about 27787.4147951910. The cubic root of 772140421 is about 917.4141395201.

Adding to 772140421 its reverse (124041277), we get a palindrome (896181698).

The spelling of 772140421 in words is "seven hundred seventy-two million, one hundred forty thousand, four hundred twenty-one".