400353999 has 8 divisors (see below), whose sum is σ = 542853120. Its totient is φ = 262378776.

The previous prime is 400353979. The next prime is 400354007. The reversal of 400353999 is 999353004.

It is a happy number.

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

It is not a de Polignac number, because 400353999 - 2⁹ = 400353487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400353999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400353979) 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, 1130767 + ... + 1131120.

It is an arithmetic number, because the mean of its divisors is an integer number (67856640).

Almost surely, 2^400353999 is an apocalyptic number.

400353999 is a deficient number, since it is larger than the sum of its proper divisors (142499121).

400353999 is a wasteful number, since it uses less digits than its factorization.

400353999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261949.

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 400353999 is about 20008.8480178145. The cubic root of 400353999 is about 737.0235928838.

The spelling of 400353999 in words is "four hundred million, three hundred fifty-three thousand, nine hundred ninety-nine".