400039690420 has 48 divisors (see below), whose sum is σ = 861748525008. Its totient is φ = 155899837440.

The previous prime is 400039690387. The next prime is 400039690429. The reversal of 400039690420 is 24096930004.

It can be written as a sum of positive squares in 8 ways, for example, as 41628304 + 399998062116 = 6452^2 + 632454^2 .

It is a super-2 number, since 2×400039690420² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400039690420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400039690429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268282 + ... + 933838.

It is an arithmetic number, because the mean of its divisors is an integer number (17953094271).

Almost surely, 2^400039690420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400039690420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (430874262504).

400039690420 is an abundant number, since it is smaller than the sum of its proper divisors (461708834588).

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

400039690420 is a wasteful number, since it uses less digits than its factorization.

400039690420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666340 (or 666338 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 400039690420 in words is "four hundred billion, thirty-nine million, six hundred ninety thousand, four hundred twenty".