1625989427 has 8 divisors (see below), whose sum is σ = 1636667760. Its totient is φ = 1615330080.

The previous prime is 1625989381. The next prime is 1625989481. The reversal of 1625989427 is 7249895261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1625989427 - 2⁶ = 1625989363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1625989627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193724 + ... + 201942.

It is an arithmetic number, because the mean of its divisors is an integer number (204583470).

Almost surely, 2^1625989427 is an apocalyptic number.

1625989427 is a deficient number, since it is larger than the sum of its proper divisors (10678333).

1625989427 is a wasteful number, since it uses less digits than its factorization.

1625989427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493.

The product of its digits is 2177280, while the sum is 53.

The square root of 1625989427 is about 40323.5592055066. The cubic root of 1625989427 is about 1175.9059081687.

The spelling of 1625989427 in words is "one billion, six hundred twenty-five million, nine hundred eighty-nine thousand, four hundred twenty-seven".