1987090 has 16 divisors (see below), whose sum is σ = 4087872. Its totient is φ = 681264.

The previous prime is 1987081. The next prime is 1987091. The reversal of 1987090 is 907891.

It is not an unprimeable number, because it can be changed into a prime (1987091) 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, 14124 + ... + 14263.

It is an arithmetic number, because the mean of its divisors is an integer number (255492).

2^1987090 is an apocalyptic number.

1987090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987090 is an abundant number, since it is smaller than the sum of its proper divisors (2100782).

1987090 is a wasteful number, since it uses less digits than its factorization.

1987090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28401.

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

The square root of 1987090 is about 1409.6417984722. The cubic root of 1987090 is about 125.7204265743.

The spelling of 1987090 in words is "one million, nine hundred eighty-seven thousand, ninety".