1987331 has 8 divisors (see below), whose sum is σ = 2056560. Its totient is φ = 1919232.

The previous prime is 1987313. The next prime is 1987333. The reversal of 1987331 is 1337891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987331 is a prime.

It is a super-2 number, since 2×1987331² = 7898969007122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4655 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (257070).

2^1987331 is an apocalyptic number.

1987331 is a deficient number, since it is larger than the sum of its proper divisors (69229).

1987331 is a wasteful number, since it uses less digits than its factorization.

1987331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565.

The product of its digits is 4536, while the sum is 32.

The square root of 1987331 is about 1409.7272785897. The cubic root of 1987331 is about 125.7255089473.

The spelling of 1987331 in words is "one million, nine hundred eighty-seven thousand, three hundred thirty-one".