1778426412 has 24 divisors (see below), whose sum is σ = 4742470656. Its totient is φ = 508121808.

The previous prime is 1778426407. The next prime is 1778426437. The reversal of 1778426412 is 2146248771.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10585788 + ... + 10585955.

It is an arithmetic number, because the mean of its divisors is an integer number (197602944).

Almost surely, 2^1778426412 is an apocalyptic number.

1778426412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1778426412 is an abundant number, since it is smaller than the sum of its proper divisors (2964044244).

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

1778426412 is a wasteful number, since it uses less digits than its factorization.

1778426412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21171757 (or 21171755 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 1778426412 is about 42171.3932897646. The cubic root of 1778426412 is about 1211.5610414655.

The spelling of 1778426412 in words is "one billion, seven hundred seventy-eight million, four hundred twenty-six thousand, four hundred twelve".