905720427 has 16 divisors (see below), whose sum is σ = 1400148480. Its totient is φ = 577560456.

The previous prime is 905720423. The next prime is 905720449. The reversal of 905720427 is 724027509.

It is not a de Polignac number, because 905720427 - 2² = 905720423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 905720391 and 905720400.

It is not an unprimeable number, because it can be changed into a prime (905720423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 728623 + ... + 729864.

It is an arithmetic number, because the mean of its divisors is an integer number (87509280).

Almost surely, 2^905720427 is an apocalyptic number.

905720427 is a deficient number, since it is larger than the sum of its proper divisors (494428053).

905720427 is a wasteful number, since it uses less digits than its factorization.

905720427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458519 (or 1458513 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 905720427 is about 30095.1894328645. The cubic root of 905720427 is about 967.5306257958.

The spelling of 905720427 in words is "nine hundred five million, seven hundred twenty thousand, four hundred twenty-seven".