1987401 has 16 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 1210560.

The previous prime is 1987373. The next prime is 1987411. The reversal of 1987401 is 1047891.

It is not a de Polignac number, because 1987401 - 2⁹ = 1986889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1987411) 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 15 ways as a sum of consecutive naturals, for example, 4915 + ... + 5303.

It is an arithmetic number, because the mean of its divisors is an integer number (180180).

2^1987401 is an apocalyptic number.

It is an amenable number.

1987401 is a deficient number, since it is larger than the sum of its proper divisors (895479).

1987401 is a wasteful number, since it uses less digits than its factorization.

1987401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 1987401 is about 1409.7521058683. The cubic root of 1987401 is about 125.7269850783.

The spelling of 1987401 in words is "one million, nine hundred eighty-seven thousand, four hundred one".