19420040 has 32 divisors (see below), whose sum is σ = 43870680. Its totient is φ = 7736832.

The previous prime is 19420031. The next prime is 19420061. The reversal of 19420040 is 4002491.

It can be written as a sum of positive squares in 4 ways, for example, as 17926756 + 1493284 = 4234^2 + 1222^2 .

It is a super-3 number, since 3×19420040³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 19419994 and 19420021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10892 + ... + 12548.

Almost surely, 2^19420040 is an apocalyptic number.

19420040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19420040 is an abundant number, since it is smaller than the sum of its proper divisors (24450640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19420040 is a wasteful number, since it uses less digits than its factorization.

19420040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 19420040 is about 4406.8174457311. The cubic root of 19420040 is about 268.7922277255.

The spelling of 19420040 in words is "nineteen million, four hundred twenty thousand, forty".