1213523502440 has 32 divisors (see below), whose sum is σ = 2730476575080. Its totient is φ = 485400744192.

The previous prime is 1213523502419. The next prime is 1213523502461. The reversal of 1213523502440 is 442053253121.

It is an interprime number because it is at equal distance from previous prime (1213523502419) and next prime (1213523502461).

It can be written as a sum of positive squares in 4 ways, for example, as 1212910147684 + 613354756 = 1101322^2 + 24766^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1213523502397 and 1213523502406.

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, 2302562 + ... + 2780078.

Almost surely, 2^{1213523502440} is an apocalyptic number.

1213523502440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213523502440 is an abundant number, since it is smaller than the sum of its proper divisors (1516953072640).

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

1213523502440 is a wasteful number, since it uses less digits than its factorization.

1213523502440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541061 (or 541057 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 1213523502440 its reverse (442053253121), we get a palindrome (1655576755561).

The spelling of 1213523502440 in words is "one trillion, two hundred thirteen billion, five hundred twenty-three million, five hundred two thousand, four hundred forty".