19790397 has 36 divisors (see below), whose sum is σ = 33300540. Its totient is φ = 11278080.

The previous prime is 19790387. The next prime is 19790411. The reversal of 19790397 is 79309791.

It can be written as a sum of positive squares in 2 ways, for example, as 12467961 + 7322436 = 3531^2 + 2706^2 .

It is not a de Polignac number, because 19790397 - 2⁶ = 19790333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19790347) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17979 + ... + 19047.

It is an arithmetic number, because the mean of its divisors is an integer number (925015).

Almost surely, 2^19790397 is an apocalyptic number.

19790397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19790397 is a deficient number, since it is larger than the sum of its proper divisors (13510143).

19790397 is a wasteful number, since it uses less digits than its factorization.

19790397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 19790397 is about 4448.6399045101. The cubic root of 19790397 is about 270.4901795094.

The spelling of 19790397 in words is "nineteen million, seven hundred ninety thousand, three hundred ninety-seven".