400004549973 has 24 divisors (see below), whose sum is σ = 661680925568. Its totient is φ = 228104659872.

The previous prime is 400004549963. The next prime is 400004549977. The reversal of 400004549973 is 379945400004.

It is a happy number.

400004549973 is a `hidden beast` number, since 40 + 0 + 0 + 0 + 454 + 99 + 73 = 666.

It is not a de Polignac number, because 400004549973 - 2¹⁰ = 400004548949 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 (400004549977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6488086 + ... + 6549447.

Almost surely, 2^400004549973 is an apocalyptic number.

It is an amenable number.

400004549973 is a deficient number, since it is larger than the sum of its proper divisors (261676375595).

400004549973 is a wasteful number, since it uses less digits than its factorization.

400004549973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13038033 (or 13038030 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

Adding to 400004549973 its reverse (379945400004), we get a palindrome (779949949977).

The spelling of 400004549973 in words is "four hundred billion, four million, five hundred forty-nine thousand, nine hundred seventy-three".