642294437 has 8 divisors (see below), whose sum is σ = 654597240. Its totient is φ = 630048960.

The previous prime is 642294431. The next prime is 642294463. The reversal of 642294437 is 734492246.

It can be written as a sum of positive squares in 4 ways, for example, as 27552001 + 614742436 = 5249^2 + 24794^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642294437 - 2⁸ = 642294181 is a prime.

It is a super-2 number, since 2×642294437² = 825084287602293938, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642294394 and 642294403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642294431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8639 + ... + 36867.

It is an arithmetic number, because the mean of its divisors is an integer number (81824655).

Almost surely, 2^642294437 is an apocalyptic number.

It is an amenable number.

642294437 is a deficient number, since it is larger than the sum of its proper divisors (12302803).

642294437 is a wasteful number, since it uses less digits than its factorization.

642294437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28663.

The product of its digits is 290304, while the sum is 41.

The square root of 642294437 is about 25343.5285033478. The cubic root of 642294437 is about 862.8024841726.

The spelling of 642294437 in words is "six hundred forty-two million, two hundred ninety-four thousand, four hundred thirty-seven".