406432240 has 20 divisors (see below), whose sum is σ = 944955144. Its totient is φ = 162572864.

The previous prime is 406432237. The next prime is 406432253. The reversal of 406432240 is 42234604.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×406432240² = 330374331422835200, which contains 22 as substring.

It is a congruent number.

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, 2540122 + ... + 2540281.

Almost surely, 2^406432240 is an apocalyptic number.

406432240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

406432240 is an abundant number, since it is smaller than the sum of its proper divisors (538522904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406432240 is a wasteful number, since it uses less digits than its factorization.

406432240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080416 (or 5080410 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 406432240 is about 20160.1646818671. The cubic root of 406432240 is about 740.7347462453.

Adding to 406432240 its reverse (42234604), we get a palindrome (448666844).

The spelling of 406432240 in words is "four hundred six million, four hundred thirty-two thousand, two hundred forty".