420253691 has 12 divisors (see below), whose sum is σ = 497466816. Its totient is φ = 352659120.

The previous prime is 420253679. The next prime is 420253697. The reversal of 420253691 is 196352024.

It is a happy number.

It is not a de Polignac number, because 420253691 - 2¹⁸ = 419991547 is a prime.

It is a super-2 number, since 2×420253691² = 353226329598246962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420253697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132011 + ... + 135156.

It is an arithmetic number, because the mean of its divisors is an integer number (41455568).

Almost surely, 2^420253691 is an apocalyptic number.

420253691 is a deficient number, since it is larger than the sum of its proper divisors (77213125).

420253691 is a wasteful number, since it uses less digits than its factorization.

420253691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267202 (or 267191 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 420253691 is about 20500.0900241926. The cubic root of 420253691 is about 749.0379908751.

The spelling of 420253691 in words is "four hundred twenty million, two hundred fifty-three thousand, six hundred ninety-one".