781449426 has 48 divisors (see below), whose sum is σ = 1823777280. Its totient is φ = 241116480.

The previous prime is 781449419. The next prime is 781449433. The reversal of 781449426 is 624944187.

It is an interprime number because it is at equal distance from previous prime (781449419) and next prime (781449433).

It is a super-2 number, since 2×781449426² = 1221326410791458952, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17611 + ... + 43278.

It is an arithmetic number, because the mean of its divisors is an integer number (37995360).

Almost surely, 2^781449426 is an apocalyptic number.

781449426 is an abundant number, since it is smaller than the sum of its proper divisors (1042327854).

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

781449426 is a wasteful number, since it uses less digits than its factorization.

781449426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60951 (or 60948 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 781449426 is about 27954.4169318553. The cubic root of 781449426 is about 921.0862351039.

It can be divided in two parts, 781449 and 426, that added together give a triangular number (781875 = T₁₂₅₀).

The spelling of 781449426 in words is "seven hundred eighty-one million, four hundred forty-nine thousand, four hundred twenty-six".