1971401376 has 48 divisors (see below), whose sum is σ = 5914206144. Its totient is φ = 563257344.

The previous prime is 1971401371. The next prime is 1971401387. The reversal of 1971401376 is 6731041791.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (1971401371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1466145 + ... + 1467488.

It is an arithmetic number, because the mean of its divisors is an integer number (123212628).

Almost surely, 2^1971401376 is an apocalyptic number.

1971401376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1971401376 is an abundant number, since it is smaller than the sum of its proper divisors (3942804768).

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

1971401376 is a wasteful number, since it uses less digits than its factorization.

1971401376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933653 (or 2933645 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 1971401376 is about 44400.4659435011. The cubic root of 1971401376 is about 1253.8868615320.

The spelling of 1971401376 in words is "one billion, nine hundred seventy-one million, four hundred one thousand, three hundred seventy-six".