1987929450 has 72 divisors (see below), whose sum is σ = 5751759468. Its totient is φ = 489335040.

The previous prime is 1987929409. The next prime is 1987929487. The reversal of 1987929450 is 549297891.

It can be written as a sum of positive squares in 6 ways, for example, as 453562209 + 1534367241 = 21297^2 + 39171^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 164059 + ... + 175758.

Almost surely, 2^1987929450 is an apocalyptic number.

1987929450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987929450 is an abundant number, since it is smaller than the sum of its proper divisors (3763830018).

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

1987929450 is a wasteful number, since it uses less digits than its factorization.

1987929450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339848 (or 339840 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The square root of 1987929450 is about 44586.2024621968. The cubic root of 1987929450 is about 1257.3812769406.

The spelling of 1987929450 in words is "one billion, nine hundred eighty-seven million, nine hundred twenty-nine thousand, four hundred fifty".