42776391 has 16 divisors (see below), whose sum is σ = 68614400. Its totient is φ = 23156928.

The previous prime is 42776359. The next prime is 42776399. The reversal of 42776391 is 19367724.

It is not a de Polignac number, because 42776391 - 2⁵ = 42776359 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42776399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53206 + ... + 54003.

It is an arithmetic number, because the mean of its divisors is an integer number (4288400).

Almost surely, 2^42776391 is an apocalyptic number.

42776391 is a deficient number, since it is larger than the sum of its proper divisors (25838009).

42776391 is a wasteful number, since it uses less digits than its factorization.

42776391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107238.

The product of its digits is 63504, while the sum is 39.

The square root of 42776391 is about 6540.3662741470. The cubic root of 42776391 is about 349.7314702196.

The spelling of 42776391 in words is "forty-two million, seven hundred seventy-six thousand, three hundred ninety-one".