3642921 has 8 divisors (see below), whose sum is σ = 5396960. Its totient is φ = 2428596.

The previous prime is 3642911. The next prime is 3642931. The reversal of 3642921 is 1292463.

It is an interprime number because it is at equal distance from previous prime (3642911) and next prime (3642931).

It is not a de Polignac number, because 3642921 - 2¹⁵ = 3610153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 134923 = 3642921 / (3 + 6 + 4 + 2 + 9 + 2 + 1).

It is a Duffinian number.

3642921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3642911) 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, 67435 + ... + 67488.

It is an arithmetic number, because the mean of its divisors is an integer number (674620).

Almost surely, 2^3642921 is an apocalyptic number.

It is an amenable number.

3642921 is a deficient number, since it is larger than the sum of its proper divisors (1754039).

3642921 is a wasteful number, since it uses less digits than its factorization.

3642921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134932 (or 134926 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 3642921 is about 1908.6437593223. The cubic root of 3642921 is about 153.8685700478.

The spelling of 3642921 in words is "three million, six hundred forty-two thousand, nine hundred twenty-one".