400030071 has 24 divisors (see below), whose sum is σ = 635597424. Its totient is φ = 223009920.

The previous prime is 400030067. The next prime is 400030073. The reversal of 400030071 is 170030004.

It is not a de Polignac number, because 400030071 - 2² = 400030067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400030071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400030073) 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, 27160 + ... + 39213.

It is an arithmetic number, because the mean of its divisors is an integer number (26483226).

Almost surely, 2^400030071 is an apocalyptic number.

400030071 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

400030071 is a deficient number, since it is larger than the sum of its proper divisors (235567353).

400030071 is a wasteful number, since it uses less digits than its factorization.

400030071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66431 (or 66424 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 400030071 is about 20000.7517608714. The cubic root of 400030071 is about 736.8247630173.

Adding to 400030071 its reverse (170030004), we get a palindrome (570060075).

The spelling of 400030071 in words is "four hundred million, thirty thousand, seventy-one".