19390990 has 32 divisors (see below), whose sum is σ = 35868096. Its totient is φ = 7545600.

The previous prime is 19390981. The next prime is 19391003. The reversal of 19390990 is 9909391.

It is a super-4 number, since 4×19390990⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73599 + ... + 73861.

It is an arithmetic number, because the mean of its divisors is an integer number (1120878).

Almost surely, 2^19390990 is an apocalyptic number.

19390990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19390990 is a deficient number, since it is larger than the sum of its proper divisors (16477106).

19390990 is a wasteful number, since it uses less digits than its factorization.

19390990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 19683, while the sum is 40.

The square root of 19390990 is about 4403.5201827629. The cubic root of 19390990 is about 268.6581340962.

The spelling of 19390990 in words is "nineteen million, three hundred ninety thousand, nine hundred ninety".