1217378492 has 12 divisors (see below), whose sum is σ = 2324086296. Its totient is φ = 553353840.

The previous prime is 1217378489. The next prime is 1217378509. The reversal of 1217378492 is 2948737121.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 27667693 = 1217378492 / (1 + 2 + 1 + 7 + 3 + 7 + 8 + 4 + 9 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13833803 + ... + 13833890.

It is an arithmetic number, because the mean of its divisors is an integer number (193673858).

Almost surely, 2^1217378492 is an apocalyptic number.

It is an amenable number.

1217378492 is a deficient number, since it is larger than the sum of its proper divisors (1106707804).

1217378492 is a wasteful number, since it uses less digits than its factorization.

1217378492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27667708 (or 27667706 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The square root of 1217378492 is about 34890.9514344335. The cubic root of 1217378492 is about 1067.7638372555.

The spelling of 1217378492 in words is "one billion, two hundred seventeen million, three hundred seventy-eight thousand, four hundred ninety-two".