3490021257 has 4 divisors (see below), whose sum is σ = 4653361680. Its totient is φ = 2326680836.

The previous prime is 3490021231. The next prime is 3490021279. The reversal of 3490021257 is 7521200943.

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: 7521200943 = 3 ⋅2507066981.

It is a cyclic number.

It is not a de Polignac number, because 3490021257 - 2²⁶ = 3422912393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3490021957) 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, 581670207 + ... + 581670212.

It is an arithmetic number, because the mean of its divisors is an integer number (1163340420).

Almost surely, 2^3490021257 is an apocalyptic number.

It is an amenable number.

3490021257 is a deficient number, since it is larger than the sum of its proper divisors (1163340423).

3490021257 is a wasteful number, since it uses less digits than its factorization.

3490021257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163340422.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 3490021257 is about 59076.4018623342. The cubic root of 3490021257 is about 1516.8501914749.

The spelling of 3490021257 in words is "three billion, four hundred ninety million, twenty-one thousand, two hundred fifty-seven".