75037421 has 4 divisors (see below), whose sum is σ = 76867644. Its totient is φ = 73207200.

The previous prime is 75037409. The next prime is 75037433. The reversal of 75037421 is 12473057.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12473057 = 1531 ⋅8147.

It is an interprime number because it is at equal distance from previous prime (75037409) and next prime (75037433).

It can be written as a sum of positive squares in 2 ways, for example, as 33292900 + 41744521 = 5770^2 + 6461^2 .

It is a cyclic number.

It is not a de Polignac number, because 75037421 - 2¹⁰ = 75036397 is a prime.

It is a super-2 number, since 2×75037421² = 11261229100662482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75037121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915050 + ... + 915131.

It is an arithmetic number, because the mean of its divisors is an integer number (19216911).

Almost surely, 2^75037421 is an apocalyptic number.

It is an amenable number.

75037421 is a deficient number, since it is larger than the sum of its proper divisors (1830223).

75037421 is a wasteful number, since it uses less digits than its factorization.

75037421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830222.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 75037421 is about 8662.4142708601. The cubic root of 75037421 is about 421.7864589752.

The spelling of 75037421 in words is "seventy-five million, thirty-seven thousand, four hundred twenty-one".