42400425 has 24 divisors (see below), whose sum is σ = 70736544. Its totient is φ = 22408960.

The previous prime is 42400411. The next prime is 42400427. The reversal of 42400425 is 52400424.

It is not a de Polignac number, because 42400425 - 2⁶ = 42400361 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (42400427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5974 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (2947356).

Almost surely, 2^42400425 is an apocalyptic number.

It is an amenable number.

42400425 is a deficient number, since it is larger than the sum of its proper divisors (28336119).

42400425 is a wasteful number, since it uses less digits than its factorization.

42400425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129 (or 5124 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 42400425 is about 6511.5608727862. The cubic root of 42400425 is about 348.7038453328.

Adding to 42400425 its reverse (52400424), we get a palindrome (94800849).

Subtracting 42400425 from its reverse (52400424), we obtain a palindrome (9999999).

The spelling of 42400425 in words is "forty-two million, four hundred thousand, four hundred twenty-five".