1640198 has 16 divisors (see below), whose sum is σ = 2849280. Its totient is φ = 693576.

The previous prime is 1640189. The next prime is 1640201. The reversal of 1640198 is 8910461.

1640198 is a modest number, since divided by 198 gives 164 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1640198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365 + ... + 1847.

It is an arithmetic number, because the mean of its divisors is an integer number (178080).

2^1640198 is an apocalyptic number.

1640198 is a deficient number, since it is larger than the sum of its proper divisors (1209082).

1640198 is a wasteful number, since it uses less digits than its factorization.

1640198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1640198 is about 1280.7021511655. The cubic root of 1640198 is about 117.9321164660.

The spelling of 1640198 in words is "one million, six hundred forty thousand, one hundred ninety-eight".