400015442 has 8 divisors (see below), whose sum is σ = 600166476. Its totient is φ = 199959952.

The previous prime is 400015403. The next prime is 400015453. The reversal of 400015442 is 244510004.

It can be written as a sum of positive squares in 2 ways, for example, as 369754441 + 30261001 = 19229^2 + 5501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12293 + ... + 30840.

Almost surely, 2^400015442 is an apocalyptic number.

400015442 is a deficient number, since it is larger than the sum of its proper divisors (200151034).

400015442 is a wasteful number, since it uses less digits than its factorization.

400015442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47772.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 400015442 is about 20000.3860462742. The cubic root of 400015442 is about 736.8157810751.

Adding to 400015442 its reverse (244510004), we get a palindrome (644525446).

The spelling of 400015442 in words is "four hundred million, fifteen thousand, four hundred forty-two".