1987078492 has 24 divisors (see below), whose sum is σ = 4111198560. Its totient is φ = 822239040.

The previous prime is 1987078433. The next prime is 1987078493. The reversal of 1987078492 is 2948707891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987078493) 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, 1222759 + ... + 1224382.

It is an arithmetic number, because the mean of its divisors is an integer number (171299940).

Almost surely, 2^1987078492 is an apocalyptic number.

It is an amenable number.

1987078492 is an abundant number, since it is smaller than the sum of its proper divisors (2124120068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1987078492 is a wasteful number, since it uses less digits than its factorization.

1987078492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447181 (or 2447179 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 55.

The square root of 1987078492 is about 44576.6586006623. The cubic root of 1987078492 is about 1257.2018387543.

The spelling of 1987078492 in words is "one billion, nine hundred eighty-seven million, seventy-eight thousand, four hundred ninety-two".