400722352645 has 8 divisors (see below), whose sum is σ = 480872067480. Its totient is φ = 320574385920.

The previous prime is 400722352577. The next prime is 400722352703. The reversal of 400722352645 is 546253227004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 74798968036 + 325923384609 = 273494^2 + 570897^2 .

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

It is not a de Polignac number, because 400722352645 - 2¹¹ = 400722350597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400722352598 and 400722352607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135465 + ... + 905425.

It is an arithmetic number, because the mean of its divisors is an integer number (60109008435).

Almost surely, 2^400722352645 is an apocalyptic number.

It is an amenable number.

400722352645 is a deficient number, since it is larger than the sum of its proper divisors (80149714835).

400722352645 is a wasteful number, since it uses less digits than its factorization.

400722352645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874055.

The product of its (nonzero) digits is 403200, while the sum is 40.

Adding to 400722352645 its reverse (546253227004), we get a palindrome (946975579649).

The spelling of 400722352645 in words is "four hundred billion, seven hundred twenty-two million, three hundred fifty-two thousand, six hundred forty-five".