1897829140 has 12 divisors (see below), whose sum is σ = 3985441236. Its totient is φ = 759131648.

The previous prime is 1897829137. The next prime is 1897829189. The reversal of 1897829140 is 419287981.

It can be written as a sum of positive squares in 2 ways, for example, as 1467349636 + 430479504 = 38306^2 + 20748^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47445709 + ... + 47445748.

It is an arithmetic number, because the mean of its divisors is an integer number (332120103).

Almost surely, 2^1897829140 is an apocalyptic number.

1897829140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897829140 is an abundant number, since it is smaller than the sum of its proper divisors (2087612096).

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

1897829140 is a wasteful number, since it uses less digits than its factorization.

1897829140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94891466 (or 94891464 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 1897829140 is about 43564.0808464955. The cubic root of 1897829140 is about 1238.0904401415.

The spelling of 1897829140 in words is "one billion, eight hundred ninety-seven million, eight hundred twenty-nine thousand, one hundred forty".