372145721 has 4 divisors (see below), whose sum is σ = 374016000. Its totient is φ = 370275444.

The previous prime is 372145703. The next prime is 372145769. The reversal of 372145721 is 127541273.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127541273 = 1933 ⋅65981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-372145721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (372145771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 934841 + ... + 935238.

It is an arithmetic number, because the mean of its divisors is an integer number (93504000).

Almost surely, 2^372145721 is an apocalyptic number.

It is an amenable number.

372145721 is a deficient number, since it is larger than the sum of its proper divisors (1870279).

372145721 is a wasteful number, since it uses less digits than its factorization.

372145721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870278.

The product of its digits is 11760, while the sum is 32.

The square root of 372145721 is about 19291.0787930587. The cubic root of 372145721 is about 719.2905312049.

Adding to 372145721 its reverse (127541273), we get a palindrome (499686994).

The spelling of 372145721 in words is "three hundred seventy-two million, one hundred forty-five thousand, seven hundred twenty-one".