1989527690 has 16 divisors (see below), whose sum is σ = 3583977192. Its totient is φ = 795182784.

The previous prime is 1989527689. The next prime is 1989527759. The reversal of 1989527690 is 967259891.

It can be written as a sum of positive squares in 4 ways, for example, as 1956912169 + 32615521 = 44237^2 + 5711^2 .

It is a super-2 number, since 2×1989527690² = 7916440858553472200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65129 + ... + 90668.

Almost surely, 2^1989527690 is an apocalyptic number.

1989527690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989527690 is a deficient number, since it is larger than the sum of its proper divisors (1594449502).

1989527690 is a wasteful number, since it uses less digits than its factorization.

1989527690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157081.

The product of its (nonzero) digits is 2449440, while the sum is 56.

The square root of 1989527690 is about 44604.1218947308. The cubic root of 1989527690 is about 1257.7181532047.

The spelling of 1989527690 in words is "one billion, nine hundred eighty-nine million, five hundred twenty-seven thousand, six hundred ninety".