736806421 has 8 divisors (see below), whose sum is σ = 793762200. Its totient is φ = 679890432.

The previous prime is 736806397. The next prime is 736806431. The reversal of 736806421 is 124608637.

It can be written as a sum of positive squares in 4 ways, for example, as 23328900 + 713477521 = 4830^2 + 26711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-736806421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (736806431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36621 + ... + 53053.

It is an arithmetic number, because the mean of its divisors is an integer number (99220275).

Almost surely, 2^736806421 is an apocalyptic number.

It is an amenable number.

736806421 is a deficient number, since it is larger than the sum of its proper divisors (56955779).

736806421 is a wasteful number, since it uses less digits than its factorization.

736806421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19895.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 736806421 is about 27144.1783997969. The cubic root of 736806421 is about 903.2011196897.

The spelling of 736806421 in words is "seven hundred thirty-six million, eight hundred six thousand, four hundred twenty-one".