1212764380 has 24 divisors (see below), whose sum is σ = 2561040720. Its totient is φ = 482394240.

The previous prime is 1212764353. The next prime is 1212764381. The reversal of 1212764380 is 834672121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212764381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165801 + ... + 172960.

It is an arithmetic number, because the mean of its divisors is an integer number (106710030).

Almost surely, 2^1212764380 is an apocalyptic number.

1212764380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212764380 is an abundant number, since it is smaller than the sum of its proper divisors (1348276340).

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

1212764380 is a wasteful number, since it uses less digits than its factorization.

1212764380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338949 (or 338947 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 1212764380 is about 34824.7667616023. The cubic root of 1212764380 is about 1066.4131152987.

The spelling of 1212764380 in words is "one billion, two hundred twelve million, seven hundred sixty-four thousand, three hundred eighty".