400000424 has 16 divisors (see below), whose sum is σ = 762296820. Its totient is φ = 196721280.

The previous prime is 400000411. The next prime is 400000457. The reversal of 400000424 is 424000004.

It can be written as a sum of positive squares in 2 ways, for example, as 361684324 + 38316100 = 19018^2 + 6190^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400000399 and 400000408.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409349 + ... + 410324.

Almost surely, 2^400000424 is an apocalyptic number.

It is an amenable number.

400000424 is a deficient number, since it is larger than the sum of its proper divisors (362296396).

400000424 is a wasteful number, since it uses less digits than its factorization.

400000424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819740 (or 819736 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 400000424 is about 20000.0105999972. The cubic root of 400000424 is about 736.8065600662.

Adding to 400000424 its reverse (424000004), we get a palindrome (824000428).

The spelling of 400000424 in words is "four hundred million, four hundred twenty-four", and thus it is an aban number.