780365421 has 30 divisors (see below), whose sum is σ = 1281356846. Its totient is φ = 472942800.

The previous prime is 780365407. The next prime is 780365479. The reversal of 780365421 is 124563087.

780365421 is a `hidden beast` number, since 7 + 80 + 36 + 542 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 559842921 + 220522500 = 23661^2 + 14850^2 .

It is not a de Polignac number, because 780365421 - 2¹³ = 780357229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780365221) 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 29 ways as a sum of consecutive naturals, for example, 30010 + ... + 49611.

Almost surely, 2^780365421 is an apocalyptic number.

It is an amenable number.

780365421 is a deficient number, since it is larger than the sum of its proper divisors (500991425).

780365421 is a wasteful number, since it uses less digits than its factorization.

780365421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79655 (or 79635 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 780365421 is about 27935.0214068291. The cubic root of 780365421 is about 920.6601362476.

The spelling of 780365421 in words is "seven hundred eighty million, three hundred sixty-five thousand, four hundred twenty-one".