1987554156 has 24 divisors (see below), whose sum is σ = 5300144640. Its totient is φ = 567872592.

The previous prime is 1987554103. The next prime is 1987554157. The reversal of 1987554156 is 6514557891.

It is a junction number, because it is equal to n+sod(n) for n = 1987554099 and 1987554108.

It is not an unprimeable number, because it can be changed into a prime (1987554157) 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, 11830596 + ... + 11830763.

It is an arithmetic number, because the mean of its divisors is an integer number (220839360).

Almost surely, 2^1987554156 is an apocalyptic number.

It is an amenable number.

1987554156 is an abundant number, since it is smaller than the sum of its proper divisors (3312590484).

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

1987554156 is a wasteful number, since it uses less digits than its factorization.

1987554156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23661373 (or 23661371 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 51.

The square root of 1987554156 is about 44581.9936297156. The cubic root of 1987554156 is about 1257.3021464753.

The spelling of 1987554156 in words is "one billion, nine hundred eighty-seven million, five hundred fifty-four thousand, one hundred fifty-six".