42278477 has 4 divisors (see below), whose sum is σ = 44503680. Its totient is φ = 40053276.

The previous prime is 42278447. The next prime is 42278497. The reversal of 42278477 is 77487224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42278477 - 2⁶ = 42278413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42278447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1112573 + ... + 1112610.

It is an arithmetic number, because the mean of its divisors is an integer number (11125920).

Almost surely, 2^42278477 is an apocalyptic number.

It is an amenable number.

42278477 is a deficient number, since it is larger than the sum of its proper divisors (2225203).

42278477 is a wasteful number, since it uses less digits than its factorization.

42278477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225202.

The product of its digits is 175616, while the sum is 41.

The square root of 42278477 is about 6502.1901694737. The cubic root of 42278477 is about 348.3692215694.

The spelling of 42278477 in words is "forty-two million, two hundred seventy-eight thousand, four hundred seventy-seven".