247380421 has 4 divisors (see below), whose sum is σ = 250360992. Its totient is φ = 244399852.

The previous prime is 247380407. The next prime is 247380443. The reversal of 247380421 is 124083742.

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 247380421 - 2⁵ = 247380389 is a prime.

It is a super-2 number, since 2×247380421² = 122394145388274482, 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 (247380491) 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, 1490161 + ... + 1490326.

It is an arithmetic number, because the mean of its divisors is an integer number (62590248).

Almost surely, 2^247380421 is an apocalyptic number.

It is an amenable number.

247380421 is a deficient number, since it is larger than the sum of its proper divisors (2980571).

247380421 is an equidigital number, since it uses as much as digits as its factorization.

247380421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980570.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 247380421 is about 15728.3317932958. The cubic root of 247380421 is about 627.7524862364.

The spelling of 247380421 in words is "two hundred forty-seven million, three hundred eighty thousand, four hundred twenty-one".