340403777478 has 128 divisors (see below), whose sum is σ = 797421098880. Its totient is φ = 107495424000.

The previous prime is 340403777477. The next prime is 340403777521. The reversal of 340403777478 is 874777304043.

It is a happy number.

340403777478 is a `hidden beast` number, since 34 + 0 + 40 + 37 + 77 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340403777477) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44313798 + ... + 44321478.

It is an arithmetic number, because the mean of its divisors is an integer number (6229852335).

Almost surely, 2^340403777478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 340403777478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398710549440).

340403777478 is an abundant number, since it is smaller than the sum of its proper divisors (457017321402).

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

340403777478 is a wasteful number, since it uses less digits than its factorization.

340403777478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8311 (or 8305 counting only the distinct ones).

The product of its (nonzero) digits is 11063808, while the sum is 54.

The spelling of 340403777478 in words is "three hundred forty billion, four hundred three million, seven hundred seventy-seven thousand, four hundred seventy-eight".