1987455 has 16 divisors (see below), whose sum is σ = 3266784. Its totient is φ = 1031040.

The previous prime is 1987451. The next prime is 1987471. The reversal of 1987455 is 5547891.

It is not a de Polignac number, because 1987455 - 2² = 1987451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987451) 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, 1236 + ... + 2345.

It is an arithmetic number, because the mean of its divisors is an integer number (204174).

2^1987455 is an apocalyptic number.

1987455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1987455 is a deficient number, since it is larger than the sum of its proper divisors (1279329).

1987455 is a wasteful number, since it uses less digits than its factorization.

1987455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626.

The product of its digits is 50400, while the sum is 39.

The square root of 1987455 is about 1409.7712580415. The cubic root of 1987455 is about 125.7281237842.

It can be divided in two parts, 1987 and 455, that added together give a palindrome (2442).

The spelling of 1987455 in words is "one million, nine hundred eighty-seven thousand, four hundred fifty-five".