19740390 has 32 divisors (see below), whose sum is σ = 47748096. Its totient is φ = 5222880.

The previous prime is 19740361. The next prime is 19740401. The reversal of 19740390 is 9304791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1419 + ... + 6441.

It is an arithmetic number, because the mean of its divisors is an integer number (1492128).

Almost surely, 2^19740390 is an apocalyptic number.

19740390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19740390 is an abundant number, since it is smaller than the sum of its proper divisors (28007706).

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

19740390 is a wasteful number, since it uses less digits than its factorization.

19740390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5164.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 19740390 is about 4443.0158676287. The cubic root of 19740390 is about 270.2621596368.

The spelling of 19740390 in words is "nineteen million, seven hundred forty thousand, three hundred ninety".