1891402646 has 12 divisors (see below), whose sum is σ = 3300304788. Its totient is φ = 810601092.

The previous prime is 1891402627. The next prime is 1891402651. The reversal of 1891402646 is 6462041981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9649916 + ... + 9650111.

It is an arithmetic number, because the mean of its divisors is an integer number (275025399).

Almost surely, 2^1891402646 is an apocalyptic number.

1891402646 is a deficient number, since it is larger than the sum of its proper divisors (1408902142).

1891402646 is a wasteful number, since it uses less digits than its factorization.

1891402646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19300043 (or 19300036 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 1891402646 is about 43490.2592082411. The cubic root of 1891402646 is about 1236.6913716832.

The spelling of 1891402646 in words is "one billion, eight hundred ninety-one million, four hundred two thousand, six hundred forty-six".