420781897 has 4 divisors (see below), whose sum is σ = 422776336. Its totient is φ = 418787460.

The previous prime is 420781877. The next prime is 420781919. The reversal of 420781897 is 798187024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420781897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420781877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996903 + ... + 997324.

It is an arithmetic number, because the mean of its divisors is an integer number (105694084).

Almost surely, 2^420781897 is an apocalyptic number.

It is an amenable number.

420781897 is a deficient number, since it is larger than the sum of its proper divisors (1994439).

420781897 is a wasteful number, since it uses less digits than its factorization.

420781897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994438.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 420781897 is about 20512.9689952479. The cubic root of 420781897 is about 749.3516749870.

The spelling of 420781897 in words is "four hundred twenty million, seven hundred eighty-one thousand, eight hundred ninety-seven".