1898228640 has 864 divisors, whose sum is σ = 8252979840. Its totient is φ = 364277760.

The previous prime is 1898228627. The next prime is 1898228641. The reversal of 1898228640 is 468228981.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1898228640.

It is not an unprimeable number, because it can be changed into a prime (1898228641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 65456146 + ... + 65456174.

It is an arithmetic number, because the mean of its divisors is an integer number (9552060).

Almost surely, 2^1898228640 is an apocalyptic number.

1898228640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1898228640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4126489920).

1898228640 is an abundant number, since it is smaller than the sum of its proper divisors (6354751200).

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

1898228640 is a wasteful number, since it uses less digits than its factorization.

1898228640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The square root of 1898228640 is about 43568.6658046812. The cubic root of 1898228640 is about 1238.1773082405.

The spelling of 1898228640 in words is "one billion, eight hundred ninety-eight million, two hundred twenty-eight thousand, six hundred forty".