420537391 has 4 divisors (see below), whose sum is σ = 422860984. Its totient is φ = 418213800.

The previous prime is 420537373. The next prime is 420537401. The reversal of 420537391 is 193735024.

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

It is a cyclic number.

It is not a de Polignac number, because 420537391 - 2¹⁷ = 420406319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420537791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1161525 + ... + 1161886.

It is an arithmetic number, because the mean of its divisors is an integer number (105715246).

Almost surely, 2^420537391 is an apocalyptic number.

420537391 is a deficient number, since it is larger than the sum of its proper divisors (2323593).

420537391 is a wasteful number, since it uses less digits than its factorization.

420537391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323592.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 420537391 is about 20507.0083386144. The cubic root of 420537391 is about 749.2065035955.

The spelling of 420537391 in words is "four hundred twenty million, five hundred thirty-seven thousand, three hundred ninety-one".