403999990 has 16 divisors (see below), whose sum is σ = 734262048. Its totient is φ = 160030656.

The previous prime is 403999969. The next prime is 403999993. The reversal of 403999990 is 99999304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403999993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195087 + ... + 197146.

It is an arithmetic number, because the mean of its divisors is an integer number (45891378).

Almost surely, 2^403999990 is an apocalyptic number.

403999990 is a deficient number, since it is larger than the sum of its proper divisors (330262058).

403999990 is a wasteful number, since it uses less digits than its factorization.

403999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392343.

The product of its (nonzero) digits is 708588, while the sum is 52.

The square root of 403999990 is about 20099.7509934825. The cubic root of 403999990 is about 739.2541730719.

The spelling of 403999990 in words is "four hundred three million, nine hundred ninety-nine thousand, nine hundred ninety".