42779451 has 16 divisors (see below), whose sum is σ = 67011840. Its totient is φ = 23932320.

The previous prime is 42779423. The next prime is 42779461. The reversal of 42779451 is 15497724.

42779451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42779451 - 2⁷ = 42779323 is a prime.

It is a super-2 number, since 2×42779451² = 3660162855722802, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (42779461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49431 + ... + 50288.

It is an arithmetic number, because the mean of its divisors is an integer number (4188240).

Almost surely, 2^42779451 is an apocalyptic number.

42779451 is a deficient number, since it is larger than the sum of its proper divisors (24232389).

42779451 is a wasteful number, since it uses less digits than its factorization.

42779451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99746.

The product of its digits is 70560, while the sum is 39.

The square root of 42779451 is about 6540.6002018163. The cubic root of 42779451 is about 349.7398093428.

The spelling of 42779451 in words is "forty-two million, seven hundred seventy-nine thousand, four hundred fifty-one".