400281645 has 16 divisors (see below), whose sum is σ = 674159040. Its totient is φ = 202247424.

The previous prime is 400281631. The next prime is 400281653. The reversal of 400281645 is 546182004.

It is not a de Polignac number, because 400281645 - 2¹⁶ = 400216109 is a prime.

It is a super-3 number, since 3×400281645³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 701964 + ... + 702533.

It is an arithmetic number, because the mean of its divisors is an integer number (42134940).

Almost surely, 2^400281645 is an apocalyptic number.

It is an amenable number.

400281645 is a deficient number, since it is larger than the sum of its proper divisors (273877395).

400281645 is a wasteful number, since it uses less digits than its factorization.

400281645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404524.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 400281645 is about 20007.0398860001. The cubic root of 400281645 is about 736.9791906648.

The spelling of 400281645 in words is "four hundred million, two hundred eighty-one thousand, six hundred forty-five".