42400553 has 4 divisors (see below), whose sum is σ = 45662148. Its totient is φ = 39138960.

The previous prime is 42400549. The next prime is 42400573. The reversal of 42400553 is 35500424.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16104169 + 26296384 = 4013^2 + 5128^2 .

It is a cyclic number.

It is not a de Polignac number, because 42400553 - 2² = 42400549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42400513) 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, 1630778 + ... + 1630803.

It is an arithmetic number, because the mean of its divisors is an integer number (11415537).

Almost surely, 2^42400553 is an apocalyptic number.

It is an amenable number.

42400553 is a deficient number, since it is larger than the sum of its proper divisors (3261595).

42400553 is a wasteful number, since it uses less digits than its factorization.

42400553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261594.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 42400553 is about 6511.5707014514. The cubic root of 42400553 is about 348.7041962259.

Adding to 42400553 its reverse (35500424), we get a palindrome (77900977).

The spelling of 42400553 in words is "forty-two million, four hundred thousand, five hundred fifty-three".