1891020190 has 16 divisors (see below), whose sum is σ = 3405001392. Its totient is φ = 756149184.

The previous prime is 1891020169. The next prime is 1891020199. The reversal of 1891020190 is 910201981.

It is a super-2 number, since 2×1891020190² = 7151914717975272200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891020199) 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, 159 + ... + 61498.

It is an arithmetic number, because the mean of its divisors is an integer number (212812587).

Almost surely, 2^1891020190 is an apocalyptic number.

1891020190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1891020190 is a deficient number, since it is larger than the sum of its proper divisors (1513981202).

1891020190 is a wasteful number, since it uses less digits than its factorization.

1891020190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64731.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 1891020190 is about 43485.8619553528. The cubic root of 1891020190 is about 1236.6080099305.

The spelling of 1891020190 in words is "one billion, eight hundred ninety-one million, twenty thousand, one hundred ninety".