3721431 has 8 divisors (see below), whose sum is σ = 5670784. Its totient is φ = 2126520.

The previous prime is 3721411. The next prime is 3721439. The reversal of 3721431 is 1341273.

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

It is not a de Polignac number, because 3721431 - 2⁷ = 3721303 is a prime.

It is a super-2 number, since 2×3721431² = 27698097375522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 177211 = 3721431 / (3 + 7 + 2 + 1 + 4 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 3721398 and 3721407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721439) 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, 88585 + ... + 88626.

It is an arithmetic number, because the mean of its divisors is an integer number (708848).

Almost surely, 2^3721431 is an apocalyptic number.

3721431 is a deficient number, since it is larger than the sum of its proper divisors (1949353).

3721431 is a wasteful number, since it uses less digits than its factorization.

3721431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177221.

The product of its digits is 504, while the sum is 21.

The square root of 3721431 is about 1929.1010859983. The cubic root of 3721431 is about 154.9660834566.

The spelling of 3721431 in words is "three million, seven hundred twenty-one thousand, four hundred thirty-one".