420619945 has 4 divisors (see below), whose sum is σ = 504743940. Its totient is φ = 336495952.

The previous prime is 420619939. The next prime is 420619961. The reversal of 420619945 is 549916024.

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 317231721 + 103388224 = 17811^2 + 10168^2 .

It is a cyclic number.

It is not a de Polignac number, because 420619945 - 2⁷ = 420619817 is a prime.

It is a super-2 number, since 2×420619945² = 353842276263606050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 420619898 and 420619907.

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, 42061990 + ... + 42061999.

It is an arithmetic number, because the mean of its divisors is an integer number (126185985).

Almost surely, 2^420619945 is an apocalyptic number.

It is an amenable number.

420619945 is a deficient number, since it is larger than the sum of its proper divisors (84123995).

420619945 is an equidigital number, since it uses as much as digits as its factorization.

420619945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84123994.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 420619945 is about 20509.0210639123. The cubic root of 420619945 is about 749.2555249574.

The spelling of 420619945 in words is "four hundred twenty million, six hundred nineteen thousand, nine hundred forty-five".