19739340 has 36 divisors (see below), whose sum is σ = 59876544. Its totient is φ = 5263776.

The previous prime is 19739333. The next prime is 19739341. The reversal of 19739340 is 4393791.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19739295 and 19739304.

It is not an unprimeable number, because it can be changed into a prime (19739341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54652 + ... + 55011.

Almost surely, 2^19739340 is an apocalyptic number.

19739340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19739340 is an abundant number, since it is smaller than the sum of its proper divisors (40137204).

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

19739340 is a wasteful number, since it uses less digits than its factorization.

19739340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109678 (or 109673 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 19739340 is about 4442.8977030762. The cubic root of 19739340 is about 270.2573677642.

The spelling of 19739340 in words is "nineteen million, seven hundred thirty-nine thousand, three hundred forty".