1656385388 has 24 divisors (see below), whose sum is σ = 3456805632. Its totient is φ = 679014864.

The previous prime is 1656385387. The next prime is 1656385391. The reversal of 1656385388 is 8835836561.

It is a super-2 number, since 2×1656385388² = 5487225107159821088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1656385387) 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, 1285370 + ... + 1286657.

It is an arithmetic number, because the mean of its divisors is an integer number (144033568).

Almost surely, 2^1656385388 is an apocalyptic number.

It is an amenable number.

1656385388 is an abundant number, since it is smaller than the sum of its proper divisors (1800420244).

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

1656385388 is a wasteful number, since it uses less digits than its factorization.

1656385388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572061 (or 2572059 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 53.

The square root of 1656385388 is about 40698.7148200038. The cubic root of 1656385388 is about 1183.1881104246.

The spelling of 1656385388 in words is "one billion, six hundred fifty-six million, three hundred eighty-five thousand, three hundred eighty-eight".