1819249740 has 192 divisors, whose sum is σ = 7056645120. Its totient is φ = 378017280.

The previous prime is 1819249711. The next prime is 1819249741. The reversal of 1819249740 is 479429181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1819249741) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19704 + ... + 63456.

It is an arithmetic number, because the mean of its divisors is an integer number (36753360).

Almost surely, 2^1819249740 is an apocalyptic number.

1819249740 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 1819249740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3528322560).

1819249740 is an abundant number, since it is smaller than the sum of its proper divisors (5237395380).

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

1819249740 is a wasteful number, since it uses less digits than its factorization.

1819249740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43789 (or 43781 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1819249740 is about 42652.6639261840. The cubic root of 1819249740 is about 1220.7613585009.

The spelling of 1819249740 in words is "one billion, eight hundred nineteen million, two hundred forty-nine thousand, seven hundred forty".