400001244 has 48 divisors (see below), whose sum is σ = 947388960. Its totient is φ = 131338240.

The previous prime is 400001233. The next prime is 400001249. The reversal of 400001244 is 442100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400001249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376474 + ... + 377534.

It is an arithmetic number, because the mean of its divisors is an integer number (19737270).

Almost surely, 2^400001244 is an apocalyptic number.

It is an amenable number.

400001244 is an abundant number, since it is smaller than the sum of its proper divisors (547387716).

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

400001244 is a wasteful number, since it uses less digits than its factorization.

400001244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 400001244 is about 20000.0310999758. The cubic root of 400001244 is about 736.8070635498.

Adding to 400001244 its reverse (442100004), we get a palindrome (842101248).

The spelling of 400001244 in words is "four hundred million, one thousand, two hundred forty-four".