1987478 has 8 divisors (see below), whose sum is σ = 3011040. Its totient is φ = 983800.

The previous prime is 1987477. The next prime is 1987481. The reversal of 1987478 is 8747891.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4718 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (376380).

2^1987478 is an apocalyptic number.

1987478 is a deficient number, since it is larger than the sum of its proper divisors (1023562).

1987478 is a wasteful number, since it uses less digits than its factorization.

1987478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9942.

The product of its digits is 112896, while the sum is 44.

The square root of 1987478 is about 1409.7794153697. The cubic root of 1987478 is about 125.7286087823.

The spelling of 1987478 in words is "one million, nine hundred eighty-seven thousand, four hundred seventy-eight".