1292886978 has 16 divisors (see below), whose sum is σ = 2586793440. Its totient is φ = 430792416.

The previous prime is 1292886949. The next prime is 1292886979. The reversal of 1292886978 is 8796882921.

It is not an unprimeable number, because it can be changed into a prime (1292886979) 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, 25468 + ... + 56871.

It is an arithmetic number, because the mean of its divisors is an integer number (161674590).

Almost surely, 2^1292886978 is an apocalyptic number.

1292886978 is an abundant number, since it is smaller than the sum of its proper divisors (1293906462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1292886978 is a wasteful number, since it uses less digits than its factorization.

1292886978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84961.

The product of its digits is 6967296, while the sum is 60.

The square root of 1292886978 is about 35956.7375883853. The cubic root of 1292886978 is about 1089.3987026685.

The spelling of 1292886978 in words is "one billion, two hundred ninety-two million, eight hundred eighty-six thousand, nine hundred seventy-eight".