784572421 has 2 divisors, whose sum is σ = 784572422. Its totient is φ = 784572420.

The previous prime is 784572413. The next prime is 784572431. The reversal of 784572421 is 124275487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 784560100 + 12321 = 28010^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 784572421 - 2³ = 784572413 is a prime.

It is a super-3 number, since 3×784572421³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (784572431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392286210 + 392286211.

It is an arithmetic number, because the mean of its divisors is an integer number (392286211).

Almost surely, 2^784572421 is an apocalyptic number.

It is an amenable number.

784572421 is a deficient number, since it is larger than the sum of its proper divisors (1).

784572421 is an equidigital number, since it uses as much as digits as its factorization.

784572421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 40.

The square root of 784572421 is about 28010.2199384439. The cubic root of 784572421 is about 922.3116179794.

The spelling of 784572421 in words is "seven hundred eighty-four million, five hundred seventy-two thousand, four hundred twenty-one".