400042520 has 32 divisors (see below), whose sum is σ = 924426000. Its totient is φ = 155691648.

The previous prime is 400042493. The next prime is 400042523. The reversal of 400042520 is 25240004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400042523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133670 + ... + 136629.

Almost surely, 2^400042520 is an apocalyptic number.

400042520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400042520 is an abundant number, since it is smaller than the sum of its proper divisors (524383480).

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

400042520 is a wasteful number, since it uses less digits than its factorization.

400042520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270347 (or 270343 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 400042520 is about 20001.0629717523. The cubic root of 400042520 is about 736.8324063063.

Adding to 400042520 its reverse (25240004), we get a palindrome (425282524).

It can be divided in two parts, 40004 and 2520, that added together give a palindrome (42524).

The spelling of 400042520 in words is "four hundred million, forty-two thousand, five hundred twenty".