400147280 has 40 divisors (see below), whose sum is σ = 1001909832. Its totient is φ = 147746304.

The previous prime is 400147219. The next prime is 400147289. The reversal of 400147280 is 82741004.

It can be written as a sum of positive squares in 4 ways, for example, as 1106704 + 399040576 = 1052^2 + 19976^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400147289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191339 + ... + 193418.

Almost surely, 2^400147280 is an apocalyptic number.

400147280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400147280 is an abundant number, since it is smaller than the sum of its proper divisors (601762552).

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

400147280 is a wasteful number, since it uses less digits than its factorization.

400147280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384783 (or 384777 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 400147280 is about 20003.6816611343. The cubic root of 400147280 is about 736.8967193247.

Adding to 400147280 its reverse (82741004), we get a palindrome (482888284).

The spelling of 400147280 in words is "four hundred million, one hundred forty-seven thousand, two hundred eighty".