19420490 has 8 divisors (see below), whose sum is σ = 34956900. Its totient is φ = 7768192.

The previous prime is 19420439. The next prime is 19420501. The reversal of 19420490 is 9402491.

It can be written as a sum of positive squares in 2 ways, for example, as 17799961 + 1620529 = 4219^2 + 1273^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 971015 + ... + 971034.

Almost surely, 2^19420490 is an apocalyptic number.

19420490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19420490 is a deficient number, since it is larger than the sum of its proper divisors (15536410).

19420490 is a wasteful number, since it uses less digits than its factorization.

19420490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942056.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 19420490 is about 4406.8685026899. The cubic root of 19420490 is about 268.7943038552.

The spelling of 19420490 in words is "nineteen million, four hundred twenty thousand, four hundred ninety".