401487728399 has 4 divisors (see below), whose sum is σ = 401614664136. Its totient is φ = 401360792664.

The previous prime is 401487728381. The next prime is 401487728407. The reversal of 401487728399 is 993827784104.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401487728399 is a prime.

It is a super-2 number, since 2×401487728399² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401487728339) 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, 63463124 + ... + 63469449.

It is an arithmetic number, because the mean of its divisors is an integer number (100403666034).

Almost surely, 2^401487728399 is an apocalyptic number.

401487728399 is a deficient number, since it is larger than the sum of its proper divisors (126935737).

401487728399 is a wasteful number, since it uses less digits than its factorization.

401487728399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126935736.

The product of its (nonzero) digits is 24385536, while the sum is 62.

The spelling of 401487728399 in words is "four hundred one billion, four hundred eighty-seven million, seven hundred twenty-eight thousand, three hundred ninety-nine".