3781947 has 8 divisors (see below), whose sum is σ = 5430544. Its totient is φ = 2327328.

The previous prime is 3781909. The next prime is 3781951. The reversal of 3781947 is 7491873.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3781947 - 2⁷ = 3781819 is a prime.

It is a super-2 number, since 2×3781947² = 28606246221618, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 96973 = 3781947 / (3 + 7 + 8 + 1 + 9 + 4 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3781147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48448 + ... + 48525.

It is an arithmetic number, because the mean of its divisors is an integer number (678818).

Almost surely, 2^3781947 is an apocalyptic number.

3781947 is a deficient number, since it is larger than the sum of its proper divisors (1648597).

3781947 is a wasteful number, since it uses less digits than its factorization.

3781947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96989.

The product of its digits is 42336, while the sum is 39.

The square root of 3781947 is about 1944.7228594327. The cubic root of 3781947 is about 155.8015639305.

Adding to 3781947 its product of digits (42336), we get a palindrome (3824283).

The spelling of 3781947 in words is "three million, seven hundred eighty-one thousand, nine hundred forty-seven".