442021413 has 16 divisors (see below), whose sum is σ = 593006400. Its totient is φ = 292865664.

The previous prime is 442021409. The next prime is 442021423. The reversal of 442021413 is 314120244.

It is not a de Polignac number, because 442021413 - 2² = 442021409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 442021413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442021423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463345 + ... + 464297.

It is an arithmetic number, because the mean of its divisors is an integer number (37062900).

Almost surely, 2^442021413 is an apocalyptic number.

It is an amenable number.

442021413 is a deficient number, since it is larger than the sum of its proper divisors (150984987).

442021413 is a wasteful number, since it uses less digits than its factorization.

442021413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 442021413 is about 21024.3052917332. The cubic root of 442021413 is about 761.7534611389.

Adding to 442021413 its reverse (314120244), we get a palindrome (756141657).

The spelling of 442021413 in words is "four hundred forty-two million, twenty-one thousand, four hundred thirteen".