1216265340 has 48 divisors (see below), whose sum is σ = 3605872032. Its totient is φ = 305258496.

The previous prime is 1216265339. The next prime is 1216265371. The reversal of 1216265340 is 435626121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1216265298 and 1216265307.

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, 595189 + ... + 597228.

It is an arithmetic number, because the mean of its divisors is an integer number (75122334).

Almost surely, 2^1216265340 is an apocalyptic number.

1216265340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216265340 is an abundant number, since it is smaller than the sum of its proper divisors (2389606692).

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

1216265340 is a wasteful number, since it uses less digits than its factorization.

1216265340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192446 (or 1192444 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1216265340 is about 34874.9959139783. The cubic root of 1216265340 is about 1067.4382891160.

The spelling of 1216265340 in words is "one billion, two hundred sixteen million, two hundred sixty-five thousand, three hundred forty".