1937981 has 4 divisors (see below), whose sum is σ = 2040000. Its totient is φ = 1835964.

The previous prime is 1937959. The next prime is 1937987. The reversal of 1937981 is 1897391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1897391 = 89 ⋅21319.

It is a cyclic number.

It is not a de Polignac number, because 1937981 - 2⁶ = 1937917 is a prime.

It is a super-2 number, since 2×1937981² = 7511540712722, 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 (1937987) 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, 50981 + ... + 51018.

It is an arithmetic number, because the mean of its divisors is an integer number (510000).

2^1937981 is an apocalyptic number.

It is an amenable number.

1937981 is a deficient number, since it is larger than the sum of its proper divisors (102019).

1937981 is a wasteful number, since it uses less digits than its factorization.

1937981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102018.

The product of its digits is 13608, while the sum is 38.

The square root of 1937981 is about 1392.1138602859. The cubic root of 1937981 is about 124.6760893803.

The spelling of 1937981 in words is "one million, nine hundred thirty-seven thousand, nine hundred eighty-one".