1281397026 has 64 divisors (see below), whose sum is σ = 3231196416. Its totient is φ = 329702400.

The previous prime is 1281397001. The next prime is 1281397037. The reversal of 1281397026 is 6207931821.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6235 + ... + 51006.

It is an arithmetic number, because the mean of its divisors is an integer number (50487444).

Almost surely, 2^1281397026 is an apocalyptic number.

1281397026 is an abundant number, since it is smaller than the sum of its proper divisors (1949799390).

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

1281397026 is a wasteful number, since it uses less digits than its factorization.

1281397026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57307.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1281397026 is about 35796.6063475296. The cubic root of 1281397026 is about 1086.1619146814.

The spelling of 1281397026 in words is "one billion, two hundred eighty-one million, three hundred ninety-seven thousand, twenty-six".