1213478936 has 16 divisors (see below), whose sum is σ = 2336767440. Its totient is φ = 590340960.

The previous prime is 1213478879. The next prime is 1213478939. The reversal of 1213478936 is 6398743121.

It is a super-2 number, since 2×1213478936² = 2945062256231384192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213478939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049500 + ... + 2050091.

It is an arithmetic number, because the mean of its divisors is an integer number (146047965).

Almost surely, 2^1213478936 is an apocalyptic number.

It is an amenable number.

1213478936 is a deficient number, since it is larger than the sum of its proper divisors (1123288504).

1213478936 is a wasteful number, since it uses less digits than its factorization.

1213478936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099634 (or 4099630 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 1213478936 is about 34835.0245586249. The cubic root of 1213478936 is about 1066.6225163150.

The spelling of 1213478936 in words is "one billion, two hundred thirteen million, four hundred seventy-eight thousand, nine hundred thirty-six".