3749661 has 6 divisors (see below), whose sum is σ = 5416190. Its totient is φ = 2499768.

The previous prime is 3749657. The next prime is 3749677. The reversal of 3749661 is 1669473.

It can be written as a sum of positive squares in only one way, i.e., 2295225 + 1454436 = 1515^2 + 1206^2 .

It is not a de Polignac number, because 3749661 - 2² = 3749657 is a prime.

It is a super-2 number, since 2×3749661² = 28119915229842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3749611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208306 + ... + 208323.

Almost surely, 2^3749661 is an apocalyptic number.

It is an amenable number.

3749661 is a deficient number, since it is larger than the sum of its proper divisors (1666529).

3749661 is a wasteful number, since it uses less digits than its factorization.

3749661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416635 (or 416632 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 3749661 is about 1936.4041417018. The cubic root of 3749661 is about 155.3569435930.

The spelling of 3749661 in words is "three million, seven hundred forty-nine thousand, six hundred sixty-one".