72401837 has 4 divisors (see below), whose sum is σ = 76212480. Its totient is φ = 68591196.

The previous prime is 72401821. The next prime is 72401839. The reversal of 72401837 is 73810427.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 72401837 - 2⁴ = 72401821 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 (72401839) 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, 1905293 + ... + 1905330.

It is an arithmetic number, because the mean of its divisors is an integer number (19053120).

Almost surely, 2^72401837 is an apocalyptic number.

It is an amenable number.

72401837 is a deficient number, since it is larger than the sum of its proper divisors (3810643).

72401837 is a wasteful number, since it uses less digits than its factorization.

72401837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810642.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 72401837 is about 8508.9269006144. The cubic root of 72401837 is about 416.7892687392.

The spelling of 72401837 in words is "seventy-two million, four hundred one thousand, eight hundred thirty-seven".