2421739 has 8 divisors (see below), whose sum is σ = 2564352. Its totient is φ = 2282280.

The previous prime is 2421737. The next prime is 2421743. The reversal of 2421739 is 9371242.

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

It is a cyclic number.

It is not a de Polignac number, because 2421739 - 2¹ = 2421737 is a prime.

It is a super-4 number, since 4×2421739⁴ (a number of 27 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421733) 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, 892 + ... + 2374.

It is an arithmetic number, because the mean of its divisors is an integer number (320544).

2^2421739 is an apocalyptic number.

2421739 is a deficient number, since it is larger than the sum of its proper divisors (142613).

2421739 is a wasteful number, since it uses less digits than its factorization.

2421739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577.

The product of its digits is 3024, while the sum is 28.

The square root of 2421739 is about 1556.1937540037. The cubic root of 2421739 is about 134.2896201089.

It can be divided in two parts, 2421 and 739, that added together give a triangular number (3160 = T₇₉).

The spelling of 2421739 in words is "two million, four hundred twenty-one thousand, seven hundred thirty-nine".