420670691 has 4 divisors (see below), whose sum is σ = 480766512. Its totient is φ = 360574872.

The previous prime is 420670687. The next prime is 420670703. The reversal of 420670691 is 196076024.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 420670691 - 2² = 420670687 is a prime.

It is a super-3 number, since 3×420670691³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420670631) 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, 30047900 + ... + 30047913.

It is an arithmetic number, because the mean of its divisors is an integer number (120191628).

Almost surely, 2^420670691 is an apocalyptic number.

420670691 is a deficient number, since it is larger than the sum of its proper divisors (60095821).

420670691 is an equidigital number, since it uses as much as digits as its factorization.

420670691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60095820.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 420670691 is about 20510.2581895012. The cubic root of 420670691 is about 749.2856552388.

The spelling of 420670691 in words is "four hundred twenty million, six hundred seventy thousand, six hundred ninety-one".