1640993398 has 32 divisors (see below), whose sum is σ = 2712229920. Its totient is φ = 738447360.

The previous prime is 1640993383. The next prime is 1640993411. The reversal of 1640993398 is 8933990461.

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 15 ways as a sum of consecutive naturals, for example, 2028018 + ... + 2028826.

It is an arithmetic number, because the mean of its divisors is an integer number (84757185).

Almost surely, 2^1640993398 is an apocalyptic number.

1640993398 is a deficient number, since it is larger than the sum of its proper divisors (1071236522).

1640993398 is a wasteful number, since it uses less digits than its factorization.

1640993398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 1640993398 is about 40509.1767134312. The cubic root of 1640993398 is about 1179.5117672801.

The spelling of 1640993398 in words is "one billion, six hundred forty million, nine hundred ninety-three thousand, three hundred ninety-eight".