1897320915 has 96 divisors (see below), whose sum is σ = 3973273920. Its totient is φ = 867101760.

The previous prime is 1897320877. The next prime is 1897320917. The reversal of 1897320915 is 5190237981.

It is not a de Polignac number, because 1897320915 - 2¹¹ = 1897318867 is a prime.

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 (1897320917) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 534045 + ... + 537585.

It is an arithmetic number, because the mean of its divisors is an integer number (41388270).

Almost surely, 2^1897320915 is an apocalyptic number.

1897320915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1897320915 is an abundant number, since it is smaller than the sum of its proper divisors (2075953005).

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

1897320915 is an frugal number, since it uses more digits than its factorization.

1897320915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581 (or 3556 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1897320915 is about 43558.2473820975. The cubic root of 1897320915 is about 1237.9799130351.

The spelling of 1897320915 in words is "one billion, eight hundred ninety-seven million, three hundred twenty thousand, nine hundred fifteen".