406721249536 has 54 divisors (see below), whose sum is σ = 944401323390. Its totient is φ = 174309101568.

The previous prime is 406721249521. The next prime is 406721249551. The reversal of 406721249536 is 635942127604.

It is an interprime number because it is at equal distance from previous prime (406721249521) and next prime (406721249551).

It can be written as a sum of positive squares in only one way, i.e., 405840347136 + 880902400 = 637056^2 + 29680^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 406721249536.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 16199241 + ... + 16224328.

Almost surely, 2^406721249536 is an apocalyptic number.

It is an amenable number.

406721249536 is an abundant number, since it is smaller than the sum of its proper divisors (537680073854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406721249536 is an equidigital number, since it uses as much as digits as its factorization.

406721249536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32423599 (or 32423578 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 406721249536 in words is "four hundred six billion, seven hundred twenty-one million, two hundred forty-nine thousand, five hundred thirty-six".