42131407 has 2 divisors, whose sum is σ = 42131408. Its totient is φ = 42131406.

The previous prime is 42131399. The next prime is 42131413. The reversal of 42131407 is 70413124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42131407 - 2³ = 42131399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42131497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21065703 + 21065704.

It is an arithmetic number, because the mean of its divisors is an integer number (21065704).

Almost surely, 2^42131407 is an apocalyptic number.

42131407 is a deficient number, since it is larger than the sum of its proper divisors (1).

42131407 is an equidigital number, since it uses as much as digits as its factorization.

42131407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 42131407 is about 6490.8710509453. The cubic root of 42131407 is about 347.9648063013.

The spelling of 42131407 in words is "forty-two million, one hundred thirty-one thousand, four hundred seven".