37998661 has 4 divisors (see below), whose sum is σ = 38037772. Its totient is φ = 37959552.

The previous prime is 37998659. The next prime is 37998707. The reversal of 37998661 is 16689973.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27720225 + 10278436 = 5265^2 + 3206^2 .

It is a cyclic number.

It is not a de Polignac number, because 37998661 - 2¹ = 37998659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37990661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18060 + ... + 20053.

It is an arithmetic number, because the mean of its divisors is an integer number (9509443).

Almost surely, 2^37998661 is an apocalyptic number.

It is an amenable number.

37998661 is a deficient number, since it is larger than the sum of its proper divisors (39111).

37998661 is an equidigital number, since it uses as much as digits as its factorization.

37998661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39110.

The product of its digits is 489888, while the sum is 49.

The square root of 37998661 is about 6164.3053947708. The cubic root of 37998661 is about 336.1935917870.

The spelling of 37998661 in words is "thirty-seven million, nine hundred ninety-eight thousand, six hundred sixty-one".