1215426405140 has 24 divisors (see below), whose sum is σ = 2552491601352. Its totient is φ = 486152247680.

The previous prime is 1215426405119. The next prime is 1215426405157. The reversal of 1215426405140 is 415046245121.

It can be written as a sum of positive squares in 4 ways, for example, as 44949088144 + 1170477316996 = 212012^2 + 1081886^2 .

It is a super-2 number, since 2×1215426405140² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1215426405140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593999 + ... + 1668438.

It is an arithmetic number, because the mean of its divisors is an integer number (106353816723).

Almost surely, 2^{1215426405140} is an apocalyptic number.

1215426405140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215426405140 is an abundant number, since it is smaller than the sum of its proper divisors (1337065196212).

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

1215426405140 is a wasteful number, since it uses less digits than its factorization.

1215426405140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289307 (or 2289305 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 1215426405140 in words is "one trillion, two hundred fifteen billion, four hundred twenty-six million, four hundred five thousand, one hundred forty".