72219401 has 4 divisors (see below), whose sum is σ = 73756032. Its totient is φ = 70682772.

The previous prime is 72219397. The next prime is 72219419. The reversal of 72219401 is 10491227.

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: 10491227 = 17 ⋅617131.

It is a cyclic number.

It is not a de Polignac number, because 72219401 - 2² = 72219397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72219431) 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, 768245 + ... + 768338.

It is an arithmetic number, because the mean of its divisors is an integer number (18439008).

Almost surely, 2^72219401 is an apocalyptic number.

It is an amenable number.

72219401 is a deficient number, since it is larger than the sum of its proper divisors (1536631).

72219401 is a wasteful number, since it uses less digits than its factorization.

72219401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536630.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 72219401 is about 8498.1998682074. The cubic root of 72219401 is about 416.4389032176.

The spelling of 72219401 in words is "seventy-two million, two hundred nineteen thousand, four hundred one".