400053999 has 4 divisors (see below), whose sum is σ = 533405336. Its totient is φ = 266702664.

The previous prime is 400053991. The next prime is 400054009. The reversal of 400053999 is 999350004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 400053999 - 2³ = 400053991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400053991) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 66675664 + ... + 66675669.

It is an arithmetic number, because the mean of its divisors is an integer number (133351334).

Almost surely, 2^400053999 is an apocalyptic number.

400053999 is a deficient number, since it is larger than the sum of its proper divisors (133351337).

400053999 is a wasteful number, since it uses less digits than its factorization.

400053999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133351336.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 400053999 is about 20001.3499294423. The cubic root of 400053999 is about 736.8394539057.

The spelling of 400053999 in words is "four hundred million, fifty-three thousand, nine hundred ninety-nine".