421415378 has 4 divisors (see below), whose sum is σ = 632123070. Its totient is φ = 210707688.

The previous prime is 421415339. The next prime is 421415387. The reversal of 421415378 is 873514124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 224490289 + 196925089 = 14983^2 + 14033^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105353843 + ... + 105353846.

Almost surely, 2^421415378 is an apocalyptic number.

421415378 is a deficient number, since it is larger than the sum of its proper divisors (210707692).

421415378 is a wasteful number, since it uses less digits than its factorization.

421415378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210707691.

The product of its digits is 26880, while the sum is 35.

The square root of 421415378 is about 20528.4041756781. The cubic root of 421415378 is about 749.7275324346.

The spelling of 421415378 in words is "four hundred twenty-one million, four hundred fifteen thousand, three hundred seventy-eight".