421620737 has 4 divisors (see below), whose sum is σ = 422486976. Its totient is φ = 420754500.

The previous prime is 421620733. The next prime is 421620769. The reversal of 421620737 is 737026124.

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 421620737 - 2² = 421620733 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421620733) 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, 432389 + ... + 433362.

It is an arithmetic number, because the mean of its divisors is an integer number (105621744).

Almost surely, 2^421620737 is an apocalyptic number.

It is an amenable number.

421620737 is a deficient number, since it is larger than the sum of its proper divisors (866239).

421620737 is an equidigital number, since it uses as much as digits as its factorization.

421620737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866238.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 421620737 is about 20533.4053921896. The cubic root of 421620737 is about 749.8492953491.

The spelling of 421620737 in words is "four hundred twenty-one million, six hundred twenty thousand, seven hundred thirty-seven".