511691940 has 36 divisors (see below), whose sum is σ = 1552132764. Its totient is φ = 136451136.

The previous prime is 511691909. The next prime is 511691951. The reversal of 511691940 is 49196115.

It can be written as a sum of positive squares in 2 ways, for example, as 137733696 + 373958244 = 11736^2 + 19338^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 511691895 and 511691904.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1421187 + ... + 1421546.

It is an arithmetic number, because the mean of its divisors is an integer number (43114799).

Almost surely, 2^511691940 is an apocalyptic number.

It is an amenable number.

511691940 is an abundant number, since it is smaller than the sum of its proper divisors (1040440824).

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

511691940 is a wasteful number, since it uses less digits than its factorization.

511691940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842748 (or 2842743 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 511691940 is about 22620.6087451244. The cubic root of 511691940 is about 799.8395198932.

The spelling of 511691940 in words is "five hundred eleven million, six hundred ninety-one thousand, nine hundred forty".