1861407028 has 54 divisors (see below), whose sum is σ = 3643728102. Its totient is φ = 827089920.

The previous prime is 1861407013. The next prime is 1861407083. The reversal of 1861407028 is 8207041681.

It can be written as a sum of positive squares in 3 ways, for example, as 9998244 + 1851408784 = 3162^2 + 43028^2 .

It is a super-2 number, since 2×1861407028² = 6929672247775585568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9644500 + ... + 9644692.

Almost surely, 2^1861407028 is an apocalyptic number.

It is an amenable number.

1861407028 is a deficient number, since it is larger than the sum of its proper divisors (1782321074).

1861407028 is a wasteful number, since it uses less digits than its factorization.

1861407028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 1861407028 is about 43144.0265622021. The cubic root of 1861407028 is about 1230.1189714608.

The spelling of 1861407028 in words is "one billion, eight hundred sixty-one million, four hundred seven thousand, twenty-eight".