19950040 has 32 divisors (see below), whose sum is σ = 48969360. Its totient is φ = 7254400.

The previous prime is 19950023. The next prime is 19950041. The reversal of 19950040 is 4005991.

It is a junction number, because it is equal to n+sod(n) for n = 19949990 and 19950008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19950041) 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, 22231 + ... + 23110.

Almost surely, 2^19950040 is an apocalyptic number.

19950040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19950040 is an abundant number, since it is smaller than the sum of its proper divisors (29019320).

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

19950040 is a wasteful number, since it uses less digits than its factorization.

19950040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45363 (or 45359 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 19950040 is about 4466.5467645598. The cubic root of 19950040 is about 271.2155526913.

Subtracting from 19950040 its reverse (4005991), we obtain a square (15944049 = 3993²).

It can be divided in two parts, 19 and 950040, that added together give a palindrome (950059).

The spelling of 19950040 in words is "nineteen million, nine hundred fifty thousand, forty".