1293807891 has 16 divisors (see below), whose sum is σ = 1805301504. Its totient is φ = 822644064.

The previous prime is 1293807881. The next prime is 1293807919. The reversal of 1293807891 is 1987083921.

It is not a de Polignac number, because 1293807891 - 2⁵ = 1293807859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1293807891.

It is not an unprimeable number, because it can be changed into a prime (1293807811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3076 + ... + 50961.

It is an arithmetic number, because the mean of its divisors is an integer number (112831344).

Almost surely, 2^1293807891 is an apocalyptic number.

1293807891 is a deficient number, since it is larger than the sum of its proper divisors (511493613).

1293807891 is a wasteful number, since it uses less digits than its factorization.

1293807891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54410.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1293807891 is about 35969.5411563728. The cubic root of 1293807891 is about 1089.6572979256.

The spelling of 1293807891 in words is "one billion, two hundred ninety-three million, eight hundred seven thousand, eight hundred ninety-one".