400030520 has 16 divisors (see below), whose sum is σ = 900068760. Its totient is φ = 160012192.

The previous prime is 400030511. The next prime is 400030529. The reversal of 400030520 is 25030004.

It is an interprime number because it is at equal distance from previous prime (400030511) and next prime (400030529).

It is a junction number, because it is equal to n+sod(n) for n = 400030495 and 400030504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400030529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5000342 + ... + 5000421.

Almost surely, 2^400030520 is an apocalyptic number.

400030520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400030520 is an abundant number, since it is smaller than the sum of its proper divisors (500038240).

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

400030520 is a wasteful number, since it uses less digits than its factorization.

400030520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10000774 (or 10000770 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 400030520 is about 20000.7629854463. The cubic root of 400030520 is about 736.8250386917.

Adding to 400030520 its reverse (25030004), we get a palindrome (425060524).

The spelling of 400030520 in words is "four hundred million, thirty thousand, five hundred twenty".