2157447512 has 32 divisors (see below), whose sum is σ = 4485315600. Its totient is φ = 964579200.

The previous prime is 2157447497. The next prime is 2157447517.

It is a happy number.

2157447512 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157447517) 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, 195587 + ... + 206322.

Almost surely, 2^2157447512 is an apocalyptic number.

2157447512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2157447512 is an abundant number, since it is smaller than the sum of its proper divisors (2327868088).

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

2157447512 is a wasteful number, since it uses less digits than its factorization.

2157447512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401987 (or 401983 counting only the distinct ones).

The product of its digits is 78400, while the sum is 38.

The square root of 2157447512 is about 46448.3316384991. The cubic root of 2157447512 is about 1292.1514310328.

The spelling of 2157447512 in words is "two billion, one hundred fifty-seven million, four hundred forty-seven thousand, five hundred twelve".