42406425 has 18 divisors (see below), whose sum is σ = 75955022. Its totient is φ = 22616640.

The previous prime is 42406391. The next prime is 42406433. The reversal of 42406425 is 52460424.

It can be written as a sum of positive squares in 3 ways, for example, as 11370384 + 31036041 = 3372^2 + 5571^2 .

It is not a de Polignac number, because 42406425 - 2⁷ = 42406297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 94012 + ... + 94461.

Almost surely, 2^42406425 is an apocalyptic number.

42406425 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42406425 is a deficient number, since it is larger than the sum of its proper divisors (33548597).

42406425 is a wasteful number, since it uses less digits than its factorization.

42406425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188489 (or 188481 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 42406425 is about 6512.0215755171. The cubic root of 42406425 is about 348.7202926867.

Adding to 42406425 its reverse (52460424), we get a palindrome (94866849).

The spelling of 42406425 in words is "forty-two million, four hundred six thousand, four hundred twenty-five".