1293981887 has 8 divisors (see below), whose sum is σ = 1431499392. Its totient is φ = 1159778200.

The previous prime is 1293981883. The next prime is 1293981907. The reversal of 1293981887 is 7881893921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1293981887 - 2² = 1293981883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1293981883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827633 + ... + 829194.

It is an arithmetic number, because the mean of its divisors is an integer number (178937424).

Almost surely, 2^1293981887 is an apocalyptic number.

1293981887 is a deficient number, since it is larger than the sum of its proper divisors (137517505).

1293981887 is a wasteful number, since it uses less digits than its factorization.

1293981887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656909.

The product of its digits is 1741824, while the sum is 56.

The square root of 1293981887 is about 35971.9597325472. The cubic root of 1293981887 is about 1089.7061427641.

The spelling of 1293981887 in words is "one billion, two hundred ninety-three million, nine hundred eighty-one thousand, eight hundred eighty-seven".