1897908481 has 16 divisors (see below), whose sum is σ = 2192826240. Its totient is φ = 1609021440.

The previous prime is 1897908479. The next prime is 1897908487. The reversal of 1897908481 is 1848097981.

It is a cyclic number.

It is not a de Polignac number, because 1897908481 - 2¹ = 1897908479 is a prime.

It is a super-2 number, since 2×1897908481² = 7204113204503454722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1897908487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287425 + ... + 293953.

It is an arithmetic number, because the mean of its divisors is an integer number (137051640).

Almost surely, 2^1897908481 is an apocalyptic number.

It is an amenable number.

1897908481 is a deficient number, since it is larger than the sum of its proper divisors (294917759).

1897908481 is a wasteful number, since it uses less digits than its factorization.

1897908481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6984.

The product of its (nonzero) digits is 1161216, while the sum is 55.

The square root of 1897908481 is about 43564.9914610344. The cubic root of 1897908481 is about 1238.1076931813.

The spelling of 1897908481 in words is "one billion, eight hundred ninety-seven million, nine hundred eight thousand, four hundred eighty-one".