3721240157 has 4 divisors (see below), whose sum is σ = 3782244156. Its totient is φ = 3660236160.

The previous prime is 3721240151. The next prime is 3721240163. The reversal of 3721240157 is 7510421273.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3721240151) and next prime (3721240163).

It can be written as a sum of positive squares in 2 ways, for example, as 47183161 + 3674056996 = 6869^2 + 60614^2 .

It is a cyclic number.

It is not a de Polignac number, because 3721240157 - 2¹⁴ = 3721223773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721240151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30501908 + ... + 30502029.

It is an arithmetic number, because the mean of its divisors is an integer number (945561039).

Almost surely, 2^3721240157 is an apocalyptic number.

It is an amenable number.

3721240157 is a deficient number, since it is larger than the sum of its proper divisors (61003999).

3721240157 is an equidigital number, since it uses as much as digits as its factorization.

3721240157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61003998.

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

The square root of 3721240157 is about 61001.9684682388. The cubic root of 3721240157 is about 1549.6343441310.

The spelling of 3721240157 in words is "three billion, seven hundred twenty-one million, two hundred forty thousand, one hundred fifty-seven".