19420390 has 16 divisors (see below), whose sum is σ = 38134800. Its totient is φ = 7061920.

The previous prime is 19420369. The next prime is 19420397. The reversal of 19420390 is 9302491.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19420397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88165 + ... + 88384.

It is an arithmetic number, because the mean of its divisors is an integer number (2383425).

Almost surely, 2^19420390 is an apocalyptic number.

19420390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19420390 is a deficient number, since it is larger than the sum of its proper divisors (18714410).

19420390 is a wasteful number, since it uses less digits than its factorization.

19420390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176567.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 19420390 is about 4406.8571567501. The cubic root of 19420390 is about 268.7938424958.

The spelling of 19420390 in words is "nineteen million, four hundred twenty thousand, three hundred ninety".