1078620421 has 4 divisors (see below), whose sum is σ = 1078725952. Its totient is φ = 1078514892.

The previous prime is 1078620409. The next prime is 1078620493. The reversal of 1078620421 is 1240268701.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1078620421 - 2²¹ = 1076523269 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 (1078629421) 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, 35565 + ... + 58498.

It is an arithmetic number, because the mean of its divisors is an integer number (269681488).

Almost surely, 2^1078620421 is an apocalyptic number.

It is an amenable number.

1078620421 is a deficient number, since it is larger than the sum of its proper divisors (105531).

1078620421 is an equidigital number, since it uses as much as digits as its factorization.

1078620421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105530.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1078620421 is about 32842.3571169915. The cubic root of 1078620421 is about 1025.5485213222.

The spelling of 1078620421 in words is "one billion, seventy-eight million, six hundred twenty thousand, four hundred twenty-one".