19217940 has 48 divisors (see below), whose sum is σ = 61498752. Its totient is φ = 4392576.

The previous prime is 19217929. The next prime is 19217951. The reversal of 19217940 is 4971291.

It is an interprime number because it is at equal distance from previous prime (19217929) and next prime (19217951).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 22459 + ... + 23298.

It is an arithmetic number, because the mean of its divisors is an integer number (1281224).

Almost surely, 2^19217940 is an apocalyptic number.

19217940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19217940 is an abundant number, since it is smaller than the sum of its proper divisors (42280812).

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

19217940 is a wasteful number, since it uses less digits than its factorization.

19217940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45776 (or 45774 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 19217940 is about 4383.8270951305. The cubic root of 19217940 is about 267.8565542590.

The spelling of 19217940 in words is "nineteen million, two hundred seventeen thousand, nine hundred forty".