37981487 has 4 divisors (see below), whose sum is σ = 39632880. Its totient is φ = 36330096.

The previous prime is 37981481. The next prime is 37981507. The reversal of 37981487 is 78418973.

37981487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78418973 = 263 ⋅298171.

It is a cyclic number.

It is not a de Polignac number, because 37981487 - 2⁶ = 37981423 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 (37981481) 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 3 ways as a sum of consecutive naturals, for example, 825662 + ... + 825707.

It is an arithmetic number, because the mean of its divisors is an integer number (9908220).

Almost surely, 2^37981487 is an apocalyptic number.

37981487 is a deficient number, since it is larger than the sum of its proper divisors (1651393).

37981487 is a wasteful number, since it uses less digits than its factorization.

37981487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651392.

The product of its digits is 338688, while the sum is 47.

The square root of 37981487 is about 6162.9122174504. The cubic root of 37981487 is about 336.1429351001.

The spelling of 37981487 in words is "thirty-seven million, nine hundred eighty-one thousand, four hundred eighty-seven".