70037921 has 4 divisors (see below), whose sum is σ = 73083072. Its totient is φ = 66992772.

The previous prime is 70037917. The next prime is 70037923. The reversal of 70037921 is 12973007.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12973007 = 163 ⋅79589.

It is a cyclic number.

It is not a de Polignac number, because 70037921 - 2² = 70037917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70037923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522541 + ... + 1522586.

It is an arithmetic number, because the mean of its divisors is an integer number (18270768).

Almost surely, 2^70037921 is an apocalyptic number.

It is an amenable number.

70037921 is a deficient number, since it is larger than the sum of its proper divisors (3045151).

70037921 is a wasteful number, since it uses less digits than its factorization.

70037921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045150.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 70037921 is about 8368.8661717105. The cubic root of 70037921 is about 412.2029371462.

The spelling of 70037921 in words is "seventy million, thirty-seven thousand, nine hundred twenty-one".