1900987 has 8 divisors (see below), whose sum is σ = 2122560. Its totient is φ = 1687560.

The previous prime is 1900981. The next prime is 1901021. The reversal of 1900987 is 7890091.

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

It is a cyclic number.

It is not a de Polignac number, because 1900987 - 2¹⁹ = 1376699 is a prime.

It is a super-2 number, since 2×1900987² = 7227503148338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1900981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1537 + ... + 2482.

It is an arithmetic number, because the mean of its divisors is an integer number (265320).

2^1900987 is an apocalyptic number.

1900987 is a deficient number, since it is larger than the sum of its proper divisors (221573).

1900987 is a wasteful number, since it uses less digits than its factorization.

1900987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1900987 is about 1378.7628512547. The cubic root of 1900987 is about 123.8776759350.

The spelling of 1900987 in words is "one million, nine hundred thousand, nine hundred eighty-seven".