420154645 has 4 divisors (see below), whose sum is σ = 504185580. Its totient is φ = 336123712.

The previous prime is 420154633. The next prime is 420154661. The reversal of 420154645 is 546451024.

It is a happy number.

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 62869041 + 357285604 = 7929^2 + 18902^2 .

It is a cyclic number.

It is not a de Polignac number, because 420154645 - 2¹¹ = 420152597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42015460 + ... + 42015469.

It is an arithmetic number, because the mean of its divisors is an integer number (126046395).

Almost surely, 2^420154645 is an apocalyptic number.

It is an amenable number.

420154645 is a deficient number, since it is larger than the sum of its proper divisors (84030935).

420154645 is an equidigital number, since it uses as much as digits as its factorization.

420154645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84030934.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 420154645 is about 20497.6741363502. The cubic root of 420154645 is about 748.9791414646.

The spelling of 420154645 in words is "four hundred twenty million, one hundred fifty-four thousand, six hundred forty-five".