420952381 has 2 divisors, whose sum is σ = 420952382. Its totient is φ = 420952380.

The previous prime is 420952339. The next prime is 420952403. The reversal of 420952381 is 183259024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417548356 + 3404025 = 20434^2 + 1845^2 .

It is a cyclic number.

It is not a de Polignac number, because 420952381 - 2⁷ = 420952253 is a prime.

It is a super-2 number, since 2×420952381² = 354401814139138322, which contains 22 as substring.

It is equal to p_22392484 and since 420952381 and 22392484 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420952321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210476190 + 210476191.

It is an arithmetic number, because the mean of its divisors is an integer number (210476191).

Almost surely, 2^420952381 is an apocalyptic number.

It is an amenable number.

420952381 is a deficient number, since it is larger than the sum of its proper divisors (1).

420952381 is an equidigital number, since it uses as much as digits as its factorization.

420952381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 420952381 is about 20517.1240918409. The cubic root of 420952381 is about 749.4528637678.

The spelling of 420952381 in words is "four hundred twenty million, nine hundred fifty-two thousand, three hundred eighty-one".