19782437401 has 4 divisors (see below), whose sum is σ = 19791722704. Its totient is φ = 19773152100.

The previous prime is 19782437399. The next prime is 19782437407. The reversal of 19782437401 is 10473428791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19782437401 - 2¹ = 19782437399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19782437407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4639455 + ... + 4643716.

It is an arithmetic number, because the mean of its divisors is an integer number (4947930676).

Almost surely, 2^19782437401 is an apocalyptic number.

It is an amenable number.

19782437401 is a deficient number, since it is larger than the sum of its proper divisors (9285303).

19782437401 is an equidigital number, since it uses as much as digits as its factorization.

19782437401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9285302.

The product of its (nonzero) digits is 338688, while the sum is 46.

It can be divided in two parts, 197824 and 37401, that added together give a square (235225 = 485²).

The spelling of 19782437401 in words is "nineteen billion, seven hundred eighty-two million, four hundred thirty-seven thousand, four hundred one".