53021439 has 16 divisors (see below), whose sum is σ = 81085440. Its totient is φ = 34206840.

The previous prime is 53021431. The next prime is 53021447. The reversal of 53021439 is 93412035.

It is an interprime number because it is at equal distance from previous prime (53021431) and next prime (53021447).

It is not a de Polignac number, because 53021439 - 2³ = 53021431 is a prime.

It is a super-2 number, since 2×53021439² = 5622545987261442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53021431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30837 + ... + 32510.

It is an arithmetic number, because the mean of its divisors is an integer number (5067840).

Almost surely, 2^53021439 is an apocalyptic number.

53021439 is a deficient number, since it is larger than the sum of its proper divisors (28064001).

53021439 is a wasteful number, since it uses less digits than its factorization.

53021439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63387 (or 63381 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 53021439 is about 7281.5821769723. The cubic root of 53021439 is about 375.6792170285.

The spelling of 53021439 in words is "fifty-three million, twenty-one thousand, four hundred thirty-nine".