426399784 has 8 divisors (see below), whose sum is σ = 799499610. Its totient is φ = 213199888.

The previous prime is 426399769. The next prime is 426399791. The reversal of 426399784 is 487993624.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 379860100 + 46539684 = 19490^2 + 6822^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26649979 + ... + 26649994.

Almost surely, 2^426399784 is an apocalyptic number.

It is an amenable number.

426399784 is a deficient number, since it is larger than the sum of its proper divisors (373099826).

426399784 is a wasteful number, since it uses less digits than its factorization.

426399784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53299979 (or 53299975 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 52.

The square root of 426399784 is about 20649.4499684616. The cubic root of 426399784 is about 752.6718239876.

The spelling of 426399784 in words is "four hundred twenty-six million, three hundred ninety-nine thousand, seven hundred eighty-four".