1969997421 has 12 divisors (see below), whose sum is σ = 3055506432. Its totient is φ = 1125712728.

The previous prime is 1969997389. The next prime is 1969997423. The reversal of 1969997421 is 1247999691.

It is not a de Polignac number, because 1969997421 - 2⁵ = 1969997389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1969997423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6700525 + ... + 6700818.

It is an arithmetic number, because the mean of its divisors is an integer number (254625536).

Almost surely, 2^1969997421 is an apocalyptic number.

It is an amenable number.

1969997421 is a deficient number, since it is larger than the sum of its proper divisors (1085509011).

1969997421 is a wasteful number, since it uses less digits than its factorization.

1969997421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13401360 (or 13401353 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 57.

The square root of 1969997421 is about 44384.6529895188. The cubic root of 1969997421 is about 1253.5891344411.

The spelling of 1969997421 in words is "one billion, nine hundred sixty-nine million, nine hundred ninety-seven thousand, four hundred twenty-one".