420740551 has 8 divisors (see below), whose sum is σ = 524559744. Its totient is φ = 327849720.

The previous prime is 420740549. The next prime is 420740557. The reversal of 420740551 is 155047024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420740551 - 2¹ = 420740549 is a prime.

It is a super-2 number, since 2×420740551² = 354045222511567202, 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 (420740557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2732005 + ... + 2732158.

It is an arithmetic number, because the mean of its divisors is an integer number (65569968).

Almost surely, 2^420740551 is an apocalyptic number.

420740551 is a deficient number, since it is larger than the sum of its proper divisors (103819193).

420740551 is a wasteful number, since it uses less digits than its factorization.

420740551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464181.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 420740551 is about 20511.9611690350. The cubic root of 420740551 is about 749.3271304352.

Adding to 420740551 its reverse (155047024), we get a palindrome (575787575).

The spelling of 420740551 in words is "four hundred twenty million, seven hundred forty thousand, five hundred fifty-one".