3729991 has 2 divisors, whose sum is σ = 3729992. Its totient is φ = 3729990.

The previous prime is 3729989. The next prime is 3729997. The reversal of 3729991 is 1999273.

It is a weak prime.

It is an emirp because it is prime and its reverse (1999273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3729991 - 2¹ = 3729989 is a prime.

Together with 3729989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3729997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1864995 + 1864996.

It is an arithmetic number, because the mean of its divisors is an integer number (1864996).

Almost surely, 2^3729991 is an apocalyptic number.

3729991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3729991 is an equidigital number, since it uses as much as digits as its factorization.

3729991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 40.

The square root of 3729991 is about 1931.3184615697. The cubic root of 3729991 is about 155.0848096399.

The spelling of 3729991 in words is "three million, seven hundred twenty-nine thousand, nine hundred ninety-one".