400013250 has 128 divisors (see below), whose sum is σ = 1229050368. Its totient is φ = 84384000.

The previous prime is 400013239. The next prime is 400013279. The reversal of 400013250 is 52310004.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 65320 + ... + 71180.

It is an arithmetic number, because the mean of its divisors is an integer number (9601956).

Almost surely, 2^400013250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400013250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (614525184).

400013250 is an abundant number, since it is smaller than the sum of its proper divisors (829037118).

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

400013250 is a wasteful number, since it uses less digits than its factorization.

400013250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5901 (or 5891 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 400013250 is about 20000.3312472569. The cubic root of 400013250 is about 736.8144352078.

Adding to 400013250 its reverse (52310004), we get a palindrome (452323254).

The spelling of 400013250 in words is "four hundred million, thirteen thousand, two hundred fifty".