1968432921 has 48 divisors (see below), whose sum is σ = 3629085824. Its totient is φ = 1038282624.

The previous prime is 1968432911. The next prime is 1968432923. The reversal of 1968432921 is 1292348691.

1968432921 is a `hidden beast` number, since 196 + 8 + 432 + 9 + 21 = 666.

It is not a de Polignac number, because 1968432921 - 2⁶ = 1968432857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1968432923) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22396 + ... + 66621.

Almost surely, 2^1968432921 is an apocalyptic number.

It is an amenable number.

1968432921 is a deficient number, since it is larger than the sum of its proper divisors (1660652903).

1968432921 is an equidigital number, since it uses as much as digits as its factorization.

1968432921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89052 (or 89040 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 1968432921 is about 44367.0251538234. The cubic root of 1968432921 is about 1253.2571949859.

The spelling of 1968432921 in words is "one billion, nine hundred sixty-eight million, four hundred thirty-two thousand, nine hundred twenty-one".