42621407 has 2 divisors, whose sum is σ = 42621408. Its totient is φ = 42621406.

The previous prime is 42621391. The next prime is 42621409. The reversal of 42621407 is 70412624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42621407 - 2⁴ = 42621391 is a prime.

Together with 42621409, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2583071 and since 42621407 and 2583071 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42621409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21310703 + 21310704.

It is an arithmetic number, because the mean of its divisors is an integer number (21310704).

Almost surely, 2^42621407 is an apocalyptic number.

42621407 is a deficient number, since it is larger than the sum of its proper divisors (1).

42621407 is an equidigital number, since it uses as much as digits as its factorization.

42621407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 42621407 is about 6528.5072566399. The cubic root of 42621407 is about 349.3085860534.

The spelling of 42621407 in words is "forty-two million, six hundred twenty-one thousand, four hundred seven".