53721398 has 36 divisors (see below), whose sum is σ = 90043980. Its totient is φ = 23970240.

The previous prime is 53721391. The next prime is 53721403. The reversal of 53721398 is 89312735.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53721391) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1310258 + ... + 1310298.

Almost surely, 2^53721398 is an apocalyptic number.

53721398 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

53721398 is a deficient number, since it is larger than the sum of its proper divisors (36322582).

53721398 is a wasteful number, since it uses less digits than its factorization.

53721398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 91 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 53721398 is about 7329.4882495301. The cubic root of 53721398 is about 377.3251632524.

Multiplying 53721398 by its sum of digits (38), we get a square (2041413124 = 45182²).

53721398 divided by its sum of digits (38) gives a triangular number (1413721 = T₁₆₈₁).

The spelling of 53721398 in words is "fifty-three million, seven hundred twenty-one thousand, three hundred ninety-eight".