420561369 has 16 divisors (see below), whose sum is σ = 625670400. Its totient is φ = 279196848.

The previous prime is 420561343. The next prime is 420561373. The reversal of 420561369 is 963165024.

It is a happy number.

It is not a de Polignac number, because 420561369 - 2¹² = 420557273 is a prime.

It is a super-2 number, since 2×420561369² = 353743730190308322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420561769) 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, 26134 + ... + 39039.

It is an arithmetic number, because the mean of its divisors is an integer number (39104400).

Almost surely, 2^420561369 is an apocalyptic number.

It is an amenable number.

420561369 is a deficient number, since it is larger than the sum of its proper divisors (205109031).

420561369 is a wasteful number, since it uses less digits than its factorization.

420561369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65421 (or 65415 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 420561369 is about 20507.5929596820. The cubic root of 420561369 is about 749.2207426243.

The spelling of 420561369 in words is "four hundred twenty million, five hundred sixty-one thousand, three hundred sixty-nine".