1971263838 has 32 divisors (see below), whose sum is σ = 3969326592. Its totient is φ = 652636800.

The previous prime is 1971263803. The next prime is 1971263839. The reversal of 1971263838 is 8383621791.

It is a super-2 number, since 2×1971263838² = 7771762238012980488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971263839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621645 + ... + 624807.

It is an arithmetic number, because the mean of its divisors is an integer number (124041456).

Almost surely, 2^1971263838 is an apocalyptic number.

1971263838 is an abundant number, since it is smaller than the sum of its proper divisors (1998062754).

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

1971263838 is a wasteful number, since it uses less digits than its factorization.

1971263838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840.

The product of its digits is 435456, while the sum is 48.

The square root of 1971263838 is about 44398.9170813884. The cubic root of 1971263838 is about 1253.8577010401.

The spelling of 1971263838 in words is "one billion, nine hundred seventy-one million, two hundred sixty-three thousand, eight hundred thirty-eight".