1987954 has 4 divisors (see below), whose sum is σ = 2981934. Its totient is φ = 993976.

The previous prime is 1987939. The next prime is 1987969. The reversal of 1987954 is 4597891.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1987939) and next prime (1987969).

It can be written as a sum of positive squares in only one way, i.e., 1809025 + 178929 = 1345^2 + 423^2 .

It is a super-2 number, since 2×1987954² = 7903922212232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1987954.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496987 + ... + 496990.

2^1987954 is an apocalyptic number.

1987954 is a deficient number, since it is larger than the sum of its proper divisors (993980).

1987954 is an equidigital number, since it uses as much as digits as its factorization.

1987954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993979.

The product of its digits is 90720, while the sum is 43.

The square root of 1987954 is about 1409.9482259998. The cubic root of 1987954 is about 125.7386452943.

The spelling of 1987954 in words is "one million, nine hundred eighty-seven thousand, nine hundred fifty-four".