421908747 has 16 divisors (see below), whose sum is σ = 606900000. Its totient is φ = 259172352.

The previous prime is 421908731. The next prime is 421908763. The reversal of 421908747 is 747809124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (421908731) and next prime (421908763).

It is not a de Polignac number, because 421908747 - 2⁴ = 421908731 is a prime.

It is a super-2 number, since 2×421908747² = 356013981590220018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421908699 and 421908708.

It is not an unprimeable number, because it can be changed into a prime (421908727) 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 15 ways as a sum of consecutive naturals, for example, 13129 + ... + 31877.

It is an arithmetic number, because the mean of its divisors is an integer number (37931250).

Almost surely, 2^421908747 is an apocalyptic number.

421908747 is a deficient number, since it is larger than the sum of its proper divisors (184991253).

421908747 is a wasteful number, since it uses less digits than its factorization.

421908747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19342.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 421908747 is about 20540.4174008222. The cubic root of 421908747 is about 750.0199976890.

The spelling of 421908747 in words is "four hundred twenty-one million, nine hundred eight thousand, seven hundred forty-seven".