1291370140 has 12 divisors (see below), whose sum is σ = 2711877336. Its totient is φ = 516548048.

The previous prime is 1291370137. The next prime is 1291370177. The reversal of 1291370140 is 410731921.

It is a junction number, because it is equal to n+sod(n) for n = 1291370099 and 1291370108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32284234 + ... + 32284273.

It is an arithmetic number, because the mean of its divisors is an integer number (225989778).

Almost surely, 2^1291370140 is an apocalyptic number.

1291370140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1291370140 is an abundant number, since it is smaller than the sum of its proper divisors (1420507196).

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

1291370140 is a wasteful number, since it uses less digits than its factorization.

1291370140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64568516 (or 64568514 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1291370140 is about 35935.6388561550. The cubic root of 1291370140 is about 1088.9725019710.

The spelling of 1291370140 in words is "one billion, two hundred ninety-one million, three hundred seventy thousand, one hundred forty".