420491240 has 32 divisors (see below), whose sum is σ = 1018883880. Its totient is φ = 155258112.

The previous prime is 420491219. The next prime is 420491249. The reversal of 420491240 is 42194024.

It can be written as a sum of positive squares in 4 ways, for example, as 299359204 + 121132036 = 17302^2 + 11006^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (420491249) 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 7 ways as a sum of consecutive naturals, for example, 403799 + ... + 404838.

Almost surely, 2^420491240 is an apocalyptic number.

420491240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420491240 is an abundant number, since it is smaller than the sum of its proper divisors (598392640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420491240 is a wasteful number, since it uses less digits than its factorization.

420491240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808661 (or 808657 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 420491240 is about 20505.8830582835. The cubic root of 420491240 is about 749.1790958905.

The spelling of 420491240 in words is "four hundred twenty million, four hundred ninety-one thousand, two hundred forty".