421402517 has 4 divisors (see below), whose sum is σ = 430368576. Its totient is φ = 412436460.

The previous prime is 421402489. The next prime is 421402519. The reversal of 421402517 is 715204124.

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 421402517 - 2⁶ = 421402453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421402519) 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, 4482959 + ... + 4483052.

It is an arithmetic number, because the mean of its divisors is an integer number (107592144).

Almost surely, 2^421402517 is an apocalyptic number.

421402517 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

421402517 is a deficient number, since it is larger than the sum of its proper divisors (8966059).

421402517 is an equidigital number, since it uses as much as digits as its factorization.

421402517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8966058.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 421402517 is about 20528.0909243894. The cubic root of 421402517 is about 749.7199054832.

The spelling of 421402517 in words is "four hundred twenty-one million, four hundred two thousand, five hundred seventeen".