1987840481 has 16 divisors (see below), whose sum is σ = 2395951488. Its totient is φ = 1626873600.

The previous prime is 1987840441. The next prime is 1987840483. The reversal of 1987840481 is 1840487891.

It is a happy number.

It is not a de Polignac number, because 1987840481 - 2¹⁸ = 1987578337 is a prime.

It is a super-2 number, since 2×1987840481² = 7903019555804622722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987840483) 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, 226790 + ... + 235391.

It is an arithmetic number, because the mean of its divisors is an integer number (149746968).

Almost surely, 2^1987840481 is an apocalyptic number.

1987840481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1987840481 is a deficient number, since it is larger than the sum of its proper divisors (408111007).

1987840481 is a wasteful number, since it uses less digits than its factorization.

1987840481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462232.

The product of its (nonzero) digits is 516096, while the sum is 50.

The square root of 1987840481 is about 44585.2047320633. The cubic root of 1987840481 is about 1257.3625187928.

The spelling of 1987840481 in words is "one billion, nine hundred eighty-seven million, eight hundred forty thousand, four hundred eighty-one".