1213381378 has 32 divisors (see below), whose sum is σ = 2022870528. Its totient is φ = 541209600.

The previous prime is 1213381339. The next prime is 1213381381. The reversal of 1213381378 is 8731833121.

It is a super-4 number, since 4×1213381378⁴ (a number of 37 digits) contains 4444 as substring.

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, 773551 + ... + 775117.

It is an arithmetic number, because the mean of its divisors is an integer number (63214704).

Almost surely, 2^1213381378 is an apocalyptic number.

1213381378 is a deficient number, since it is larger than the sum of its proper divisors (809489150).

1213381378 is a wasteful number, since it uses less digits than its factorization.

1213381378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218.

The product of its digits is 24192, while the sum is 37.

The square root of 1213381378 is about 34833.6242443993. The cubic root of 1213381378 is about 1066.5939317374.

The spelling of 1213381378 in words is "one billion, two hundred thirteen million, three hundred eighty-one thousand, three hundred seventy-eight".