1298125040 has 20 divisors (see below), whose sum is σ = 3018140904. Its totient is φ = 519249984.

The previous prime is 1298125027. The next prime is 1298125043. The reversal of 1298125040 is 405218921.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1298124988 and 1298125006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298125043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8113202 + ... + 8113361.

Almost surely, 2^1298125040 is an apocalyptic number.

1298125040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1298125040 is an abundant number, since it is smaller than the sum of its proper divisors (1720015864).

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

1298125040 is a wasteful number, since it uses less digits than its factorization.

1298125040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16226576 (or 16226570 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1298125040 is about 36029.5023557084. The cubic root of 1298125040 is about 1090.8679336830.

The spelling of 1298125040 in words is "one billion, two hundred ninety-eight million, one hundred twenty-five thousand, forty".