34878421 has 4 divisors (see below), whose sum is σ = 35320000. Its totient is φ = 34436844.

The previous prime is 34878409. The next prime is 34878449. The reversal of 34878421 is 12487843.

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 a de Polignac number, because none of the positive numbers 2^k-34878421 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 (34878491) 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, 220671 + ... + 220828.

It is an arithmetic number, because the mean of its divisors is an integer number (8830000).

Almost surely, 2^34878421 is an apocalyptic number.

It is an amenable number.

34878421 is a deficient number, since it is larger than the sum of its proper divisors (441579).

34878421 is an equidigital number, since it uses as much as digits as its factorization.

34878421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441578.

The product of its digits is 43008, while the sum is 37.

The square root of 34878421 is about 5905.7955433625. The cubic root of 34878421 is about 326.7274364013.

It can be divided in two parts, 3487842 and 1, that added together give a palindrome (3487843).

The spelling of 34878421 in words is "thirty-four million, eight hundred seventy-eight thousand, four hundred twenty-one".