1012400109 has 24 divisors (see below), whose sum is σ = 1686065472. Its totient is φ = 573390720.

The previous prime is 1012400107. The next prime is 1012400113. The reversal of 1012400109 is 9010042101.

It is not a de Polignac number, because 1012400109 - 2¹ = 1012400107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012400091 and 1012400100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012400101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63987 + ... + 78224.

It is an arithmetic number, because the mean of its divisors is an integer number (70252728).

Almost surely, 2^1012400109 is an apocalyptic number.

It is an amenable number.

1012400109 is a deficient number, since it is larger than the sum of its proper divisors (673665363).

1012400109 is a wasteful number, since it uses less digits than its factorization.

1012400109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142337 (or 142334 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1012400109 is about 31818.2354790457. The cubic root of 1012400109 is about 1004.1164016536.

The spelling of 1012400109 in words is "one billion, twelve million, four hundred thousand, one hundred nine".