1897324380 has 72 divisors (see below), whose sum is σ = 6577395552. Its totient is φ = 433673856.

The previous prime is 1897324367. The next prime is 1897324393. The reversal of 1897324380 is 834237981.

1897324380 is a `hidden beast` number, since 189 + 7 + 32 + 438 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1897324367) and next prime (1897324393).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 751647 + ... + 754166.

It is an arithmetic number, because the mean of its divisors is an integer number (91352716).

Almost surely, 2^1897324380 is an apocalyptic number.

1897324380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897324380 is an abundant number, since it is smaller than the sum of its proper divisors (4680071172).

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

1897324380 is a wasteful number, since it uses less digits than its factorization.

1897324380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505835 (or 1505830 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1897324380 is about 43558.2871564069. The cubic root of 1897324380 is about 1237.9806666588.

The spelling of 1897324380 in words is "one billion, eight hundred ninety-seven million, three hundred twenty-four thousand, three hundred eighty".