420988277 has 4 divisors (see below), whose sum is σ = 434568576. Its totient is φ = 407407980.

The previous prime is 420988261. The next prime is 420988303. The reversal of 420988277 is 772889024.

It is a happy number.

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 not a de Polignac number, because 420988277 - 2⁴ = 420988261 is a prime.

It is a super-2 number, since 2×420988277² = 354462258742857458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420988247) 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, 6790103 + ... + 6790164.

It is an arithmetic number, because the mean of its divisors is an integer number (108642144).

Almost surely, 2^420988277 is an apocalyptic number.

It is an amenable number.

420988277 is a deficient number, since it is larger than the sum of its proper divisors (13580299).

420988277 is a wasteful number, since it uses less digits than its factorization.

420988277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13580298.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 420988277 is about 20517.9988546642. The cubic root of 420988277 is about 749.4741659361.

Adding to 420988277 its sum of digits (47), we get a square (420988324 = 20518²).

The spelling of 420988277 in words is "four hundred twenty million, nine hundred eighty-eight thousand, two hundred seventy-seven".