1640162190 has 16 divisors (see below), whose sum is σ = 3936389328. Its totient is φ = 437376576.

The previous prime is 1640162141. The next prime is 1640162191. The reversal of 1640162190 is 912610461.

It is a happy number.

It is a super-2 number, since 2×1640162190² = 5380264019011192200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 54672073 = 1640162190 / (1 + 6 + 4 + 0 + 1 + 6 + 2 + 1 + 9 + 0).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640162191) 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, 27336007 + ... + 27336066.

It is an arithmetic number, because the mean of its divisors is an integer number (246024333).

Almost surely, 2^1640162190 is an apocalyptic number.

1640162190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640162190 is an abundant number, since it is smaller than the sum of its proper divisors (2296227138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640162190 is a wasteful number, since it uses less digits than its factorization.

1640162190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54672083.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1640162190 is about 40498.9159114167. The cubic root of 1640162190 is about 1179.3125819977.

The spelling of 1640162190 in words is "one billion, six hundred forty million, one hundred sixty-two thousand, one hundred ninety".