381403990 has 16 divisors (see below), whose sum is σ = 748938960. Its totient is φ = 138692320.

The previous prime is 381403973. The next prime is 381404033. The reversal of 381403990 is 99304183.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1733545 + ... + 1733764.

It is an arithmetic number, because the mean of its divisors is an integer number (46808685).

Almost surely, 2^381403990 is an apocalyptic number.

381403990 is a deficient number, since it is larger than the sum of its proper divisors (367534970).

381403990 is a wasteful number, since it uses less digits than its factorization.

381403990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467327.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 381403990 is about 19529.5670714944. The cubic root of 381403990 is about 725.2065935222.

The spelling of 381403990 in words is "three hundred eighty-one million, four hundred three thousand, nine hundred ninety".