1213763540 has 48 divisors (see below), whose sum is σ = 2855793024. Its totient is φ = 429436800.

The previous prime is 1213763539. The next prime is 1213763557. The reversal of 1213763540 is 453673121.

It is a junction number, because it is equal to n+sod(n) for n = 1213763497 and 1213763506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66416 + ... + 82695.

It is an arithmetic number, because the mean of its divisors is an integer number (59495688).

Almost surely, 2^1213763540 is an apocalyptic number.

1213763540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213763540 is an abundant number, since it is smaller than the sum of its proper divisors (1642029484).

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

1213763540 is a wasteful number, since it uses less digits than its factorization.

1213763540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149168 (or 149166 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 1213763540 is about 34839.1093456764. The cubic root of 1213763540 is about 1066.7058967777.

The spelling of 1213763540 in words is "one billion, two hundred thirteen million, seven hundred sixty-three thousand, five hundred forty".