19425890 has 16 divisors (see below), whose sum is σ = 38145600. Its totient is φ = 7063920.

The previous prime is 19425839. The next prime is 19425893. The reversal of 19425890 is 9852491.

It is not an unprimeable number, because it can be changed into a prime (19425893) 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, 88190 + ... + 88409.

It is an arithmetic number, because the mean of its divisors is an integer number (2384100).

Almost surely, 2^19425890 is an apocalyptic number.

19425890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19425890 is a deficient number, since it is larger than the sum of its proper divisors (18719710).

19425890 is a wasteful number, since it uses less digits than its factorization.

19425890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176617.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 19425890 is about 4407.4811400617. The cubic root of 19425890 is about 268.8192149110.

The spelling of 19425890 in words is "nineteen million, four hundred twenty-five thousand, eight hundred ninety".