1226378657 has 8 divisors (see below), whose sum is σ = 1484021376. Its totient is φ = 989347392.

The previous prime is 1226378641. The next prime is 1226378677. The reversal of 1226378657 is 7568736221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1226378657 - 2⁴ = 1226378641 is a prime.

It is a super-2 number, since 2×1226378657² = 3008009220690247298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226378677) 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, 5152733 + ... + 5152970.

It is an arithmetic number, because the mean of its divisors is an integer number (185502672).

Almost surely, 2^1226378657 is an apocalyptic number.

1226378657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1226378657 is a deficient number, since it is larger than the sum of its proper divisors (257642719).

1226378657 is a wasteful number, since it uses less digits than its factorization.

1226378657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10305727.

The product of its digits is 846720, while the sum is 47.

The square root of 1226378657 is about 35019.6895617308. The cubic root of 1226378657 is about 1070.3887302746.

The spelling of 1226378657 in words is "one billion, two hundred twenty-six million, three hundred seventy-eight thousand, six hundred fifty-seven".